أعمدة
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أحداث في الأخبار
بقلم : نـبيـل عـمــر
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الثلاثاء، 7 أكتوبر 2008
coorption
أحداث في الأخبار
drinking water
| السرطان في زجاجة غازية
كشفت رسالة علمية تقدم بها أحد الباحثين إلى كلية العلوم جامعة المنوفية (مصر) وقام بتحكيمها الدكتور سامي محمد أبو الوفا أستاذ الكيمياء غير العضوية بكلية التربية جامعة عين شمس- عن احتواء المياه المعبأة بعد تعقيمها بالأوزون على نسبة عالية من تركيز أيون النترات والنتريت بصورة تفوق النسب المسموح بها عالميا وذلك نتيجة عدم فصل الأوكسجين عن النتروجين ما يكون أكاسيد نيتروجينية تذوب في هذه المياه أثناء عمليات التعقيم الأمر الذي يضر بصحة الإنسان ويتسبب في إصابته بالسرطان والفشل الكلوي والنوبات القلبية . www.tartoos.com عن هذه القضية يقول الدكتور سامي محمد أبو الوفا الحائز على عدة جوائز علمية رفيعة المستوى : إن منظمة الصحة العالمية حددت المواصفات القياسية لإنتاج المياه المعدنية في العالم بحيث لا تتعدى نسبة أيون النتريت 0.005 مليجرام لكل لتر ماء لخطورة هذا الأيون على صحة الإنسان كونه أحد الأسباب الرئيسية للإصابة بسرطان القولون . www.tartoos.com كذلك حددت المنظمة نسبة أيون النترات بألا يزيد على 0.1 مليجرام لكل لتر، حيث إن الزيادة تؤدي إلى الإصابة بالأزمات القلبية ويعمل هذا الأيون على أكسدة الدم وتغيير مكوناته الطبيعية . www.tartoos.com وتحدث الدكتور سامي عن طريقتين لتعقيم المياه المعدنية الأولى تتم باستخدام الأشعة فوق البنفسجية والثانية بالأوزون ومعظم الدول المتقدمة تستخدم الطريقة الأولى لأنها أكثر أمنا ولا ينتج عنها أي أضرار جانبية . www.tartoos.com أما طريقة التعقيم بالأوزون فيستخدمها معظم الشركات المنتجة للمياه المعبأة في دول العالم الثالث حيث يقوم معظم هذه الشركات بتحضير غاز الأوزون من أكسجين الهواء بواسطة جهاز مولد الأوزون وهنا تقع هذه الشركات في خطأ علمي جسيم ، فمن المعلوم أن الهواء يحتوي على 87 % نيتروجين و 21 % أكسجين و1 % غازات ثقيلة مختلفة ولكي يتم تعقيم المياه المعدنية بطريقة علمية سليمة بواسطة الأوزون يجب فصل مكونات الهواء أولاً عن طريق إسالة الهواء حتى يتم فصل غاز النيتروجين عن الأكسجين بطريقة آمنة لأن عدم فصل مكونات الهواء عن بعضها بعضا ينتج عنه تكوين الأكاسيد النيتروجينية التي تذوب في الماء وتفاعلها ينتج عن أيقونات والنترات وكلاهما يسبب سرطان القولون وفشل الكليتين والأزمات القلبية على التوالي . www.tartoos.com وهذه الحقيقة العلمية تم التأكد منها في رسالة الدكتوراه التي تناولت المياه الجوفية وتحليلها قبل وبعد التعقيم بغاز الأوزون حيث أثبتت التحاليل الكيميائية زيادة نسبة أيونات النتريت بعد التعقيم في المياه المعدنية المعبأة بتركيز 0.006 مليجرام لكل لتر ماء ، كما وجد أن نسبة النترات في الماء بعد التعقيم هي 0.15 مليجرام لكل لتر ماء وهذه النسب تزيد بمعدلات كبيرة على المسموح بها من قبل منظمة الصحة العالمية بما يشكل خطرا كبيرا على صحة شاربي هذه المياه بصفة دائمة . www.tartoos.com ويضيف الدكتور سامي أن معظم الشركات المنتجة للمياه المعدنية بتعقيم الأوزون تتجاهل كتابة نسب تركيز تلك الأيونات على النشرة الملصقة على الزجاجات وهو يحتاج إلى دور رقابي من الجهات المختصة حيث إن ضررها يكون بالغاً إذا علمنا أن الإنسان يحتاج إلى أكثر من لتر ماء في أيام الشتاء وإلى نحو لترين في فصل الصيف كما أن عدداً كبيراً من المرضى وصغار السن والمسنين هم جمهور هذه المياه مما يزيد الأمور خطورة . www.tartoos.com ويقترح د. سامي حلا لهذه المشكلة أن يتم وضع المصايد للأكسيد النيتروجينية المتكونة لدى خروجها من مولد الأوزون قبل تفاعلها مع الماء المعدني للتقليل من نسبها أو استخدام اسطوانات الأكسجين بدلا من الهواء في الحصول على غاز الأوزون المستخدم في التعقيم . www.tartoos.com وهناك طريقة أخرى حيث يمكن إسالة الهواء وفصل الأكسجين عن النيتروجين والاستفادة من النتروجين في الكثير من الأغراض الطبية ومعامل البحوث العلمية وبهذا لا نهدر عنصرا مهما كان يذوب في الماء ويسبب مخاطر صحية للإنسان . www.tartoos.com |
list of publication
Author Name task started on Wed Nov 8, 2006 at 4:16 AM
Explored by Author in CAPLUS and MEDLINE.
Abu-El-Wafa, Samy M
Selected 5 of 8 candidates
ABU EL WAFA (1 reference)
ABU EL WAFA S M (38 references)
ABU EL WAFA SAMY (1 reference)
ABU EL WAFA SAMY M (21 references)
ABU EL WAFA SAMY MOHAMED (1 reference)
Copyrights:
CAPLUS: Copyright © 2006 American Chemical Society. All Rights Reserved. (The UK patent material in this product/service is UK Crown copyright and is made available with permission. © Crown Copyright. The French (FR) patent material in this product/service is made available from Institut National de la Propriete Industrielle (INPI).)
MEDLINE: Produced by the U.S. National Library of Medicine
REGISTRY: Copyright © 2006 American Chemical Society. All Rights Reserved. (Some records contain information from GenBank(R). See also: Benson D.A., Karsch-Mizrachi I., Lipman D.J., Ostell J., Rapp B.A., Wheeler D.L. Genbank. Nucl. Acids Res. 28(1):15-18 (2000). Property values tagged with IC are from the ZIC/VINITI data file provided by InfoChem.)
CASREACT: Copyright © 2006 American Chemical Society. All Rights Reserved. (In addition to reactions indexed by CAS, CASREACT contains reactions derived from the following sources: ZIC/VINITI database (1974-1991) provided by InfoChem, INPI data prior to 1986, and Biotransformations database compiled under the direction of Professor Dr. Klaus Kieslich.)
CHEMLIST, CHEMCATS: Copyright © 2006 American Chemical Society. All Rights Reserved.
Bibliographic Information
Formation of novel mono- and multi-nuclear complexes of Mn(II), Co(II) and Cu(II) with bis azo-dianils containing the pyrimidine moiety: thermal, magnetic and spectral studies. Abu-El-Wafa, S. M.; El-Wakiel, N. A.; Issa, R. M.; Mansour, R. A. Chemistry Department, Faculty of Science, Tanta University, Egypt. Journal of Coordination Chemistry (2005), 58(8), 683-694. Publisher: Taylor & Francis Ltd., CODEN: JCCMBQ ISSN: 0095-8972. Journal written in English. CAN 143:165404 AN 2005:487487 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Mn(II), Co(II) and Cu(II) complexes with some bisazo-dianils (compds. having two N:N and two HC:N groups) contg. the pyrimidine moiety were prepd. and characterized by elemental and thermal analyses, molar conductance and magnetic moment detn. as well as IR, electronic absorption and ESR spectra. The data revealed different geometries around the metal ions, depending on both the ligand and metal ion.
Bibliographic Information
Formation of iron(III) cluster complexes with a new (N2O2) Schiff base. Saleh, Akila A.; Tawfik, Abdelrazek M.; Abu-El-Wafa, Samy M.; Osman, Hoda F. Chemistry Department, Faculty of Education, Ain Shams University, Cairo, Egypt. Journal of Coordination Chemistry (2004), 57(14), 1191-1204. Publisher: Taylor & Francis Ltd., CODEN: JCCMBQ ISSN: 0095-8972. Journal written in English. CAN 142:15807 AN 2004:900502 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Two new series of Fe(III) Schiff-base complexes prepd. from formylhydroxyacetophenone-alkylenediamine Schiff bases I and II (n = 2, 3 for both), were prepd. and characterized by elemental and thermogravimetric analyses, IR, electronic, ESR and Mossbauer spectra. The mononuclear and multinuclear Fe(III) complexes possess octahedral, pseudo-octahedral or pseudo-tetrahedral geometries around Fe(III), depending on the nature of the Schiff-base ligand used.
Bibliographic Information
Mononuclear and homobinuclear vanadium(IV), chromium(III), molybdenum(III), and uranium(VI) chelates with ortho-cresolphthalein complexone. Ismail, Tarek M.; Khedr, Abdalla M.; Abu-El-Wafa, Samy M.; Issa, Raafat M. Chemistry Department, Faculty of Education, Ein-Shams University, Cairo, Egypt. Journal of Coordination Chemistry (2004), 57(14), 1179-1190. Publisher: Taylor & Francis Ltd., CODEN: JCCMBQ ISSN: 0095-8972. Journal written in English. CAN 142:15806 AN 2004:900501 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Mononuclear and homobinuclear o-cresolphthalein complexone complexes with VO2+, Cr3+, Mo2+, and UO22+ were prepd. and their structures studied. The empirical formulas, the mode of bonding, and the geometry of the complexes were obtained from elemental and thermal analyses, IR, electronic and ESR spectra, magnetic moment detns., d.c. and CV polarog. studies.
Bibliographic Information
Hetero-binuclear chelates of Mn(II), Co(II) and Cu(II) o-cresolphthalein complexonates with other metal ions. Abu El-Wafa, Samy M.; Tawfik, Abdel Razak M.; Ismail, Tarek M. A. Chemistry Department, Faculty of Education, Ain Shams University, Cairo, Egypt. Journal of Coordination Chemistry (2004), 57(10), 813-824. Publisher: Taylor & Francis Ltd., CODEN: JCCMBQ ISSN: 0095-8972. Journal written in English. CAN 141:374132 AN 2004:732707 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Heterobinuclear metal chelates of Mn2+, Co2+ or Cu2+ and some transition metal ions with o-cresolphthalein complexone were prepd. and characterized. Elemental analyses are in agreement with proposed formulas. Thermal analyses (TGA and DTA) were used to det. the degrdn. products; some thermodn. parameters were calcd. IR and UV-visible spectra identified the mode of bonding between the metal ions and the ligand as well as its geometry. Magnetic moment detn. and ESR spectra of the heterobinuclear complex revealed some antiferromagnetic interaction between the metal ions, which depends mainly on the two metal ions forming the chelate. Electrochem. studies of [DC-polarog. and cyclic voltammetry (CV)] confirmed the existence and the nature of the metal ions in the chelate.
Bibliographic Information
Dioxouranium(VI) N2O2 Schiff's base complexes. IR, electronic, 1H NMR and mass spectra fragmentation studies. Abu-El-Wafa, S. M.; El-Baradie, K. Y.; Issa, R. M. Faculty of Education, Ain Shams University, Cairo, Egypt. Egyptian Journal of Chemistry (2002), 45(4), 743-755. Publisher: National Information and Documentation Centre, CODEN: EGJCA3 ISSN: 0449-2285. Journal written in English. CAN 141:150003 AN 2003:944980 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Complexes of UO22+ with dianionic tetradentate Schiff base ligands, RCH:N(CH2)nN:CHR (R = 2-hydroxy-1-naphthyl, n = 2-10) and bis(2-hydroxy-1-naphthylmethylene)-2-hydroxy-1,3-propanediamine, were synthesized and characterized by their elemental anal., conductometric titrn., IR, 1H NMR, electronic spectra and mass spectra. Mechanisms leading to the important different ions are suggested and identified.
Bibliographic Information
Preparation and spectroscopic characterization of copper(II), cobalt(II) and manganese(II) chelates with multidentate bisazodianils as ligands. Issa, R. M.; Abu-El-Wafa, S. M.; El-Hefnawy, G. B.; El-Wakeil, Nadia A. Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt. Egyptian Journal of Chemistry (2001), 44(1-3), 99-109. Publisher: National Information and Documentation Centre, CODEN: EGJCA3 ISSN: 0449-2285. Journal written in English. CAN 136:349665 AN 2001:819472 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Mn(II), Co(II) and Cu(II) complexes with a no. of newly prepd. bisazodianil ligands were prepd. The complexes were characterized by elemental and thermal analyses, IR, electronic and ESR spectra. The compn. and geometry of the complexes under study are established.
Bibliographic Information
Spectroscopic studies of new asymmetrical Schiff base compounds derived from 7-formyl-8-hydroxyquinoline with aliphatic and aromatic diamines and b -diketones. Abd-Elhay, H.; Abu-El-Wafa, S. M.; Ismail, T. M. A. Chemistry Department, Faculty of Education, Ain Shams University, Cairo, Egypt. Egyptian Journal of Chemistry (1998), 41(1-6), 27-42. Publisher: National Information and Documentation Centre, CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 130:296355 AN 1999:149856 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The electronic absorption spectra of some new asym. Schiff bases derived from 7-formyl-8-hydroxyquinoline(FHQ) with different diamines and b-diketones are studied in org. solvents of varying polarities. The important bands in the IR spectra of the compds. as well as the main signals of the 1H NMR spectra are discussed in relation to mol. structure. Mass spectra and the mechanism leading to different fragment ions of the compds. are also discussed.
Bibliographic Information
Synthesis and characterization of Cu(II) complexes with new mandelic hydrazones. Issa, Y. M.; Abdel-Latif, S. A.; Abu-El-Wafa, S. M.; Abdel-Salam, H. A. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt. Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry (1999), 29(1), 53-71. Publisher: Marcel Dekker, Inc., CODEN: SRIMCN ISSN: 0094-5714. Journal written in English. CAN 130:231367 AN 1999:124110 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Cu(II) chelates of new derivs. of mandelic hydrazones were synthesized and characterized using elemental and TG analyses, IR, UV-Visible and EPR spectra. X-ray diffraction patterns were used to study their structure and geometry. The study revealed that Cu(II) complexes can exhibit square planar, tetrahedral or distorted octahedral structure depending on the nature of the ligands used and the stoichiometric ratio between the metal and ligand.
Bibliographic Information
Spectroscopic studies of new symmetrical Schiff base compounds derived from 7-formyl-8-hydroxyquinoline with aliphatic and aromatic diamines. Abd-Elmottaleb, M.; Abu-El-Wafa, S.M.; Ismail, T.M. Faculty of Education, Ain Shams University, Cairo, Egypt. Egyptian Journal of Chemistry (1995), 38(3), 279-88. Publisher: National Information and Documentation Centre, CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 125:10069 AN 1996:233046 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
THE electronic absorption spectra of some new sym. Schiff bases derived from 7-formyl-8-hydroxyquinoline (FHQ) with aliph. and arom. diamines are investigated in org. solvents of varying polarities. The important bands in the IR spectra of the compds. as well as the main signals in the 1HNMR spectra are discussed in relation to mol. structure. Mass spectra and the mechanism leading to different fragment ions of the compds. are also discussed.
Bibliographic Information
Spectroscopic studies of new Schiff bases derived from 3-formyl-2-hydroxyacetophenone or 3,5-diformyl-4-hydroxyacetophenone and aliphatic diamines. Stefan, Sh. L.; Ramadan, A. A. T.; Abu-El-Wafa, S. M.; Osman, Hoda F. Faculty Education, Ain Shams University, Cairo, Egypt. Egyptian Journal of Chemistry (1994), 37(3), 207-23. Publisher: National Information and Documentation Centre, CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 122:264792 AN 1995:432033 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The electronic absorption spectra of some new Schiff bases derived from 3-formyl-2-hydroxyacetophenone or 3,5-diformyl-4-hydroxyacetophenone and aliph. diamines are investigated in org. solvents of varying polarities. The important bands in the IR spectra of the compds. as well as the main signals in the 1H NMR spectra are discussed in relation to mol. structure. Mass spectra and the mechanism leading to different fragment ions of the compds. are also discussed.
Bibliographic Information
Preparation and characterization of Cu(II)-lignocaine complex. Indirect estimation of lignocaine in pharmaceutical preparations by atomic absorption spectroscopy (AAS). El-Ries, M. A.; Abou Attia, F. M.; Abdel-Gawad, F. M.; Abu El-Wafa, S. M.. Natl. Organizations for Drug Control and Research, Cairo, Egypt. Journal of Pharmaceutical and Biomedical Analysis (1994), 12(9), 1209-13. CODEN: JPBADA ISSN: 0731-7085. Journal written in English. CAN 121:238514 AN 1994:638514 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The aim of the present work was to prep. the solid Cu-lignocaine complex and to characterize it by elemental anal., TGA, and conductance measurements. The bonding between Cu(II) and lignocaine was confirmed by IR and 1H-NMR spectra. Electronic and EPR spectral studies were conducted to explain the geometry of lignocaine mols. around the Cu(II) ion. An indirect method for the detn. of lignocaine in pharmaceutical prepns. by at. absorption spectroscopy is also explained.
Bibliographic Information
Mass spectral fragmentation studies of some high-valent dimeric manganese complexes with tetradentate Schiff base ligands. Abu-El-Wafa, S. M.; Abdel-Megeed, M. F.; Issa, R. M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Revue Roumaine de Chimie (1993), 38(7), 885-91. CODEN: RRCHAX ISSN: 0035-3930. Journal written in English. CAN 121:68651 AN 1994:468651 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Mass spectra of some high valent Mn complexes with tetradentate Schiff base as ligand [Mn(SB)O2] and [Mn2(SB)2O(OH)] were measured. The mechanisms leading to different fragment ions were suggested. The fragmentation pattern of dimeric MnIV/MnIV species were completely different from those of mixed MnIII/MnIV species. One of the fragmentation modes of MnIV/MnIV is characterized by loss of metal, accomplished with H transfer to give a typical fragmentation pattern of the corresponding ligand. The salen and naphen complexes were also characterized by homolytic cleavage of the central C-C bond, while the saltm and naphtm complexes are distinguished by unusual fragmentation due to the loss of stable allyl radical.
Bibliographic Information
Spectroscopic studies of some anilide compounds derived from ethylbenzoyl acetate. Abu-El-Wafa, S. M.; Abd-El-Rahman, R. M.; El-Gendy, Z. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1991), Volume Date 1990, 33(5), 387-98. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 118:191053 AN 1993:191053 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The electronic absorption spectra of PhCOCH2CONHX (X = substituted Ph, a- and b-naphthyl, 2-pyrimidinyl) are investigated in org. solvents of varying polarities and buffer solns. of different pH. The behavior in the latter case is used, together with potentiometric data, for calcg. pKa of the enolic OH group. The important bands in the IR and 1H NMR spectra are assigned and their Hammett plots discussed.
Bibliographic Information
UV-spectroscopic studies of new salicyloyl and benzoyl hydrazones derived from b -diketones. Abu-El-Wafa, Samy; Salib, Kamal A. R.; Saleh, Akila A.; Ismail, Tarek M. A. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1991), Volume Date 1990, 33(4), 333-44. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 118:168586 AN 1993:168586 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
UV of the title compds. (I; X,R1,R2 given:H,Me,Me;H,Me,Ph;OH,Me,Me;OH,Me,Ph) were studied in a variety of solvents and buffered solns. of different pH. The electronic absorption spectra of some new hydrazones derived from acetylacetone or benzoylacetone are investigated in org. solvents of varying polarities and buffer solns. of different pH. The study includes detn. of the acid dissocn. const. in different solvents. The behavior in the latter is utilized in calcg. the pKa of the phenolic and enolic OH groups in different solvents. The important bands in the IR spectra and the main 1H NMR signals are assigned and discussed in relation to mol. structure.
Bibliographic Information
Spectrophotometric studies of some benzoylacetanilides. Islam, Ahmed M.; Abu-El-Wafa, Samy M.; Saleh, Akila A.; Eldken, Abd El Rehem A. Fac. Sci., Al-Azhar Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1991), Volume Date 1990, 33(4), 307-19. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 118:168585 AN 1993:168585 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The red shift obsd. on going from a polar solvent to a non-polar one in the UV of the title compds. is due to solvent-solute interactions. PKa values for the anilides were deted. in aq. ethanol.
Bibliographic Information
On formation and characterization of copper(II)-anthranilic acid anilide complexes. Spectroscopic and thermogravimetric studies. Abu-El-Wafa, S. M.; Saleh, A. A.; Hassanein, M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1991), Volume Date 1990, 33(4), 321-32. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 118:159794 AN 1993:159794 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Cu(II) complexes with o-HO2CC6H4NHC(O)R [R = Ph, CH:CH2, CH2COCH3, CH2CO2Et, and CH2C(O)NHC6H4CO2H-o] were prepd. Detn. of stability consts. potentiometrically and chem. compn. by elemental anal. indicated the formation of 1:1 and 1:2 (Cu2+:L) complexes according to R. Measurements of spectroscopic (IR, electronic and EPR) and thermal (TG, DTA) behavior were carried out. The spectra indicated that Cu(II) ions are present in a nearly square planar coordination with tetragonal symmetry. TG results showed 2 types of lattice and/or coordinated H2O and/or EtOH mols.
Bibliographic Information
Preparation and characterization of polymeric molybdenum(III)-Schiff base complexes. IR, electronic, EPR and magnetic studies. Abu El-Wafa, Samy M.; Issa, Raafat M. Fac. Educat., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1991), Volume Date 1990, 33(6), 489-96. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 117:162812 AN 1992:562812 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[MoO(SB)] (HSB = 10 bis(salicylidene)- or bis(hydroxynaphthylmethylene)-alkylene or phenylene-diamines) were prepd. from the reaction of Mo(CO)6 and the Schiff bases. The prepd. complexes were subjected to elemental anal., IR, electronic, ESR spectra, and magnetic susceptibility measurements. The IR and magnetic moment values (£0.93 mB) suggested the presence of a polymeric structure. Electronic and ESR spectra data indicated octahedral geometry around Mo(III).
Bibliographic Information
Preparation and characterization of copper(II) keto or enol stabilized phosphonium complexes. Tawfik, A. M.; Abu-El-Wafa, S. M.; El-Zawawi, F. M.; Issa, R. M. Chem. Dep., Fac. Educa., Cairo, Egypt. Polyhedron (1992), 11(8), 973-7. CODEN: PLYHDE ISSN: 0277-5387. Journal written in English. CAN 117:142246 AN 1992:542246 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Two new series of copper(II) complexes were prepd. from the reaction of the salts (L) g-chloroacetonyltriphenylphosphonium chloride, p-bromophenacyltriphenylphosphonium bromide and p-nitrophenacyltriphenylphosphonium bromide with CuBr2. The complexes have the general formulae [Cu(HL)2Br2] and [CuLBr]2 and were characterized by elemental anal. and conductance measurements. The IR spectra of the complexes showed that the C:O group coordinates to the central copper(II) ion in the first type, whereas in the second type the enolic OH group is deprotonated on complex formation. Electronic and ESR spectra of the complexes were used to study the spatial distribution of the ligands around the central copper(II) ion.
Bibliographic Information
Stability constants of some bivalent transition and trivalent lanthanide metal chelates of novel benzoyl and salicyloyl hydrazones derived from b -diketones. Abu-El-Wafa, Samy M.; Ramadan, Atef A. T.; Saleh, Akila A.; Ismail, Tarek M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1991), Volume Date 1990, 33(6), 469-78. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 117:119378 AN 1992:519378 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The stability consts. of some bivalent transition and trivalent lanthanide metal chelates of novel benzoyl and salicyloyl hydrazones derived from b-diketone were detd. using potentiometric techniques in 50% vol./vol. EtOH/H2O and at 0.1 ionic strength. The values of the stability consts. were correlated and discussed in relation to the basicity factor, 2nd ionization potential, electronegativity Xm and reciprocal of the ionic radii for transition and lanthanide elements.
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Formation of chlorovanadium(III) and vanadium(IV)-N2O2-Schiff base complexes spectral and magnetic studies. Abu-El-Wafa, S. M.; Issa, R. M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Bulletin de la Societe Chimique de France (1991), (Nov.-Dec.), 805-8. CODEN: BSCFAS ISSN: 0037-8968. Journal written in English. CAN 116:206627 AN 1992:206627 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
VLCl (H2L = bis(salicylidene)- and bis(2-hydroxynaphthylmethyl)ethylenediamine) and V2L1Cl4 (H2L1 = bis(2-hydroxy-1-naphthylmethylene)-1,9-nonanediamine and p-biphenyldiamine) were prepd. and oxidized by O to give VLCl2 and V2LCl6. VQCl2 (H2Q = bis(salicylidene)- and bis(2-hydroxyphenylmethylene)acetylacetone, bis(2-hydroxynaphthylmethylene)-1,3-propanediamine) and V2Q1Cl6 (H2Q1 = bis(salicylidene)-1,4-butanediamine and- biphenyldiamine, bis(2-hydroxynaphthylmethylene)-1,5-pentanediamine, -1,10-decanediamine) were prepd. Base hydrolysis of V(naphen)Cl2 (H2naphen = bis(2-hydroxy-1-naphthylmethylene)ethylenediamine) and V2(naphpent)Cl6 (H2naphpent = bis(2-hydroxy-1-naphthylmethylene)-1,5-pentanediamine) gave VO(naphen) and V2O2(naphpent)Cl2, resp. The V(IV) complexes have an octahedral structure.
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Mass spectral fragmentation studies of some high-valent dimeric manganese complexes with tetradentate Schiff's base ligands. Abu-El-Wafa, S. M.; Abdel-Megreed, M. F.; Issa, R. M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Proceedings of the Pakistan Academy of Sciences (1991), 28(1), 41-8. CODEN: PKSPAW ISSN: 0377-2969. Journal written in English. CAN 116:206554 AN 1992:206554 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Mass spectra of [Mn(SB)O]2 (I; H2SB = bis(3-hydroxy-2-naphthylmethylene)ethanediamine and -1,3-propanediamine, bis(salicylidene)ethanediamine and -1,3-propanediamine) and [Mn2(SB)2O(OH)] (II) were measured and fully discussed. The mechanisms leading to important fragment ions are suggested. The fragmentation patterns of I were completely different from those of II. One of the fragmentation modes of I is characterized by loss of metal, accomplished with hydrogen transfer to give a fragmentation patterns typical of the corresponding ligand. Ethyenediamine Schiff base complexes are also characterized by homolytic cleavage of the central C-C bond, while the propanediamine Schiff base complexes are distinguished by unusual fragmentation due to the loss of a stable allyl radical.
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Dioxouranium(VI) complexes of Schiff bases derived from sulfonamides. El-Ries, M. A.; Abou Attia, F. M.; Aly, F. A.; Abu-El-Wafa, S. M.. Natl. Organ. Drug Control and Res., Giza, Egypt. Pakistan Journal of Scientific and Industrial Research (1991), 34(1), 23-5. CODEN: PSIRAA ISSN: 0030-9885. Journal written in English. CAN 115:246649 AN 1991:646649 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[UO2L2]×2H2O are prepd. (HL = p-XHNC6H4N:CHC6H3Z(OH-2) (Z = H, 5-Cl, X = H, 2-pyrimidinyl, CH(NH2), Ac, 4,6-dimethyl-2-pyrimidinyl). The complexes are subjected to elemental microanal. and characterized by IR, electronic, and 1H NMR spectra, TGA, and x-ray anal.
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Complex-forming properties of 2-carboxyphenylhydrazomalononitrile (2-CPHMN) with divalent and trivalent metal ions. Ramadan, Atef A. T.; Abu-El-Wafa, Samy M.; El-Inany, Gaber A.; Eid, Mohammed F. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Acta Chimica Hungarica (1991), 128(1), 53-64. CODEN: ACHUDC ISSN: 0231-3146. Journal written in English. CAN 115:173312 AN 1991:573312 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The synthesis and acid-base properties of 2-[(dicyanomethylene)hydrazino]benzoic acid (2-CPHMN) are reported. From potentiometric equil. measurements of H+ concn. at 30° and ionic strength 0.10 M (KNO3) in 75% (vol./vol.) dioxane-water medium, the values of stability consts. of 2-CPHMN complexes with transition, metal and lanthanide ions have been evaluated. The role of metal ion solvation by org. solvent is discussed in view of the results obtained for lanthanide(III)-2-CPHMN system in different media. Probable structures of metal chelates are investigated by elemental anal., IR and electronic spectra. The use of 2-CPHMN as anal. reagent for spectrophotometric detn. of copper, nickel, cobalt and iron is discussed.
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On the formation of binuclear metal complexes. The structure and conditional stability constants of lanthanide complexes with alizarin fluorine blue (alizarin complexone). Abu-El-Wafa, Samy M.; Issa, Raafat M.; El-Baradis, Hosny Y. F. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1990), Volume Date 1988, 31(2), 277-82. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 114:220067 AN 1991:220067 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The formation of M2LCl2(H2O)4 (M = Y, La - Lu; H4L = alizarin complexone (alizarin fluorine blue)) in soln. and in the solid state was established by spectroscopic methods which revealed the novel reactivity of the a-OH and the 9-carbonyl groups of H4L in chelate formation. The conditional stability consts. were detd. by the pH-metric method.
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Cobalt(II) and copper(II) complexes with benzoyl and salicyloyl hydrazones derived from b -diketones. Abu-El-Wafa, Samy M.; Salib, Kamal A. R.; El-Inany, Gaber; Ismail, Tarek M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry (1990), 20(10), 1343-54. CODEN: SRIMCN ISSN: 0094-5714. Journal written in English. CAN 114:134928 AN 1991:134928 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
CoL2.mH2O [HL = o-XC6H4C(O)NHN:C(Me)CH2C(O)R (X = H, OH; R = Me, Ph); m = 0 or 4], [CuL(H2O)2]2SO4.H2O (X = H, R = Ph), [CuL2(H2O)2].3H2O (X = H, Me), and [CuL(H2O)].nH2O (X = OH, R = Me, Ph; n = 1, 3 resp.) were synthesized and characterized by elemental and thermal anal., conductance, and IR studies. The hydrazones behave either as monobasic bidentate or dibasic tridentate ligands towards the metal cations. EPR and visible spectra show that the Co(II) complexes are tetrahedral while the Cu(II) complexes are either tetragonally distorted octahedra or square planar. Magnetic measurements indicated some assocn. between neighboring mols.
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Formation of manganese(II), cobalt(II), nickel(II), copper(II) and complexes with benzoylacetanilides. TGA, spectral, conductance and potentiometric studies. Abu-El-Wafa, S. M.; Gaber, M.; Saleh, A. A.; El-Dken, A. A. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Journal of the Chemical Society of Pakistan (1989), 11(4), 270-7. CODEN: JCSPDF ISSN: 0253-5106. Journal written in English. CAN 113:243496 AN 1990:643496 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
New Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) complexes derived from benzoylacetanilide ligands were prepd. and characterized by elemental anal. and conductance measurements. TGA, IR, and 1H NMR spectra indicated that the bonding between the ligands and bivalent metal ions takes place through H+ displacement from the enolic OH group and coordinated NH group. Electronic and EPR spectra indicated octahedral geometry around Mn2+ or Ni2+, distorted octahedral for Co2+ or Cu2+, and tetrahedral arrangement around Zn2+. The values of the conditional stability consts. calcd. by potentiometric technique depend on mol. structure. Deviation of the slopes of the s* vs. log K1 plots from unity is attributed mainly to steric effect, p-electron back donation from the metal ion, or structural changes in the ligand.
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Synthesis and characterization of mono- and binuclear copper(II) complexes with some 4-carboxy-3-hydroxyphenylhydrazo-b -diketones. Abu-El-Wafa, Samy M.; Ramadan, Atef A. T.; Ismail, Laila F. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Journal of the Chemical Society of Pakistan (1989), 11(4), 297-302. CODEN: JCSPDF ISSN: 0253-5106. Journal written in English. CAN 113:144121 AN 1990:544121 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Mono- and binuclear Cu(II) complexes of some 4-carboxy-3-hydroxyphenylhydrazo-b-diketones were synthesized and characterized by elemental anal., IR, electronic, and EPR spectra. In mononuclear complexes the ligands behave as dianionic bidentate while in binuclear complexes they act as trianionic tetradentate. EPR spectra suggested that Cu(II) has nearly square planar coordination with tetragonal symmetry.
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Synthesis and characterization of mono- and binuclear sulfate oxovanadium(IV)-Schiff base complexes. Spectral and magnetic studies. Abu-El-Wafa, S. M.; Issa, R. M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Bulletin de la Societe Chimique de France (1990), (1), 64-7. CODEN: BSCFAS ISSN: 0037-8968. Journal written in English. CAN 113:51462 AN 1990:451462 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[VO(SB)]SO4×H2O and [(VO)2(SB)(H2O)4]SO4 (H2SB are derived from acetylacetone and 2-aminophenol or aminonaphthol; and NH2(CH2)nNH2 (n = 2, 3, 4, 5, 9, 10) or diaminobiphenyl and salicylaldehyde or naphthaldehyde) were prepd. and characterized by elemental anal., IR, electronic spectra, and conductance measurements. The effective magnetic moments at room temp. of the complexes lie between 1.42-1.69 mB. Room temp. ESR spectra of the complexes in the solid state and in CHCl3 soln. suggest a tetragonal pyramidal structure in the solid state. In DMF soln. the complex acquires the octahedral structure through solvent mol. coordination.
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Complexes of manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) with dibasic tridentate benzoylacet-ortho-substituted anilides. Abu-El-Wafa, Samy M.; Issa, Raafat M.; El-Dekkin, Abd El Reheem M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical & Analytical (1990), 29A(3), 285-7. CODEN: IJCADU ISSN: 0376-4710. Journal written in English. CAN 113:33700 AN 1990:433700 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Benzoylacet-2-mercapto-, benzoylacet-2-carboxy- and benzoylacet-2-hydroxyanilide (H2L, H2L1, H2L2, resp.) were prepd. ML, ML1 and ML2 (M = Cu, Co, Ni, Mn, Zn) were also prepd. and characterized by elemental anal. IR and 1H NMR spectral data indicate that bonding occurs through deprotonated COOH, SH or OH, enolate O, and anilide N. Electronic and ESR spectra reveal that Mn, Co and Ni complexes are octahedral, Cu complexes are square planar, and Zn complexes are tetrahedral. Potentiometric titrns. indicate the formation of 1:1 complexes in soln. Their conditional stability consts. were calcd.
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Sulfito amine complexes of cobalt(III). Salib, Kamal A. R.; Abu El-Wafa, Samy M.; El-Maraghy, Salah B.; El-Sayed, Saied M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Phosphorus, Sulfur and Silicon and the Related Elements (1989), 46(3-4), 131-8. CODEN: PSSLEC ISSN: 1042-6507. Journal written in English. CAN 113:33653 AN 1990:433653 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[Co(pn)2(SO3)Cl]×H2O (pn = 1,2-propanediamine), [Co(pn)2(SO3)Cl]×4H2O×NaCl, [Co(pn)(en)(SO3)Cl]×H2O×NaCl, [Co(en)2(SO3)Br]×2H2O and [Co(pn)(en)(HSO3)2](SO3)0.5×3H2O×0.5Na2SO3 were prepd. using Na2SO3 and NaHSO3. The 2 types of products showed different and characterizing patterns of IR and UV-visible spectra. They both contain Co-SO3 linkages and the sulfite groups have similar or different site symmetries in the same compd.
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Interaction of manganese(II) Schiff's base complexes with sulfur dioxide molecules. Abu-El Wafa, Samy M.; Issa, Raafat M. Fac. Educ., Ain Shams Univ., Roxy, Egypt. Bulletin de la Societe Chimique de France (1989), (Sept.-Oct.), 595-8. CODEN: BSCFAS ISSN: 0037-8968. Journal written in English. CAN 112:209744 AN 1990:209744 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The prepn. of [Mn(SB)SO2] [H2SB = tetradentate o-HOC6H4CH:N)2Z (Z = (CH2)2, (CH2)3, (CH2)4, o-C6H4, p-C6H4, p-C6H4C6H4), (RCH:N)2Z (R = 2-hydroxynaphthyl)] is reported. The complexes are characterized by elemental anal., IR, electronic spectra and conductance measurements. TGA of the complexes indicated that the SO2 mol. is thermally stable <150-160°C after which it is evolved and the complex decomps. The effective magnetic moments at room temp. of the complexes is 5.71-5.40 mB/Mn atom. ESR spectra of the complexes in CHCl3 soln. at 300 and 93 K suggest octahedral geometry around the Mn(II) ion.
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Coordination chemical studies of some polymeric transition metal complexes with neomycin and their biological activity uses. Indirect determination of neomycin by atomic absorption spectroscopy (AAS). Abu-El-Wafa, Samy M.; El-Ries, Mohamed A.; Abou-Attia, Fikria M.; Issa, Raafat M. Fac. Educ., Ain Shams Univ., Roxy, Egypt. Analytical Letters (1989), 22(13-14), 2703-16. CODEN: ANALBP ISSN: 0003-2719. Journal written in English. CAN 112:145419 AN 1990:145419 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
A new series of polymeric [M(Neom)H2Ox]n complexes were prepd., where M = Co(II), Ni(II), Cu(II) or Zn(II) ions, Neom = neomycin and x = 2-4. The complexes were characterized by elemental anal., conductance and magnetic moment measurements. IR spectra indicated that the bonding between neomycin and transition metal ions takes place through M-O bonds. Electronic and EPR spectra of the solid complexes are measured in order to gain information about their structures and geometry. X-ray diffraction patterns indicated that the complexes are amorphous. The biol. activity of the complexes formed was tested towards eight microorganism and compared with the activity of neomycin itself. A new method is described for the indirect estn. of neomycin by at. absorption spectroscopy (AAS) using carbonate as an auxiliary ligand. The results obtained either for the pure form or in pharmaceutical formulations are accurate and precise.
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Normal sulfites of metals. Salib, Kamal A. R.; El-Maraghy, Salah B.; Abu El-Wafa, Samy M.; El-Sayed, Saied M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Transition Metal Chemistry (Dordrecht, Netherlands) (1989), 14(4), 306-8. CODEN: TMCHDN ISSN: 0340-4285. Journal written in English. CAN 112:29734 AN 1990:29734 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Normal sulfites of metals were prepd. by the reaction of metal salts with Na2S2O5, in aq. acid solns., to prevent the formation of basic sulfites. Visible spectra and magnetic moments show that the transition metal sulfites have distorted octahedral structures. The IR spectra showed that the sulfite groups act as O-bonded bridging ligands linking the metal atoms in polymeric chains.
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On the formation of nickel(II)-anthranilic acid anilide complexes. Abu-El-Wafa, Samy M.; El-Behairy, M. A.; Saleh, A. A. Fac. Educ., Ain-Shams Univ., Cairo, Egypt. Journal of the Chemical Society of Pakistan (1989), 11(1), 4-9. CODEN: JCSPDF ISSN: 0253-5106. Journal written in English. CAN 112:15533 AN 1990:15533 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The prepn. and spectral properties are reported for 9 1:2 Ni-o-HO2CC6H4NHC(O)X complexes (X = Ph, CH2CN, CH:CH2, CH2C(O)Me, CH2C(O)Ph, CH2CO2Et, CH2CH2CO2Et, CH2C(O)NH2, CH2C(O)NHC6H4CO2H-o). The coordination of the ligands was demonstrated by IR and electronic spectra. The results indicate octahedral geometry around Ni(II) ion, where EtOH mol. occupy bridged positions which lead to dimeric structure. The formation curves and consequently the stability consts. of the complexes in 50% dioxane are detd. by potentiometric techniques. The values of the stability consts. depend on mol. structure. Deviation of the s-*-log K plots slopes from unity is attributed mainly to steric effects, p-electron back donation from the metal ion or structural changes in the ligand.
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Spectroscopic studies of the ZrO2+, UO22+, and thorium(4+) chelates with 2-hydroxynaphthylazo-b -benzoylethyl acetate (HNABEA). Abu-El-Wafa, Samy M.; El-Sabakh, Enas A.; El-Sayad, Galila M. Fac. Educ., Ain Shams Univ., Egypt. Egyptian Journal of Chemistry (1988), Volume Date 1987, 30(1), 17-26. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 111:186274 AN 1989:586274 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Na[ML(H2O)n] (M = ZrO, n = 2; M = UO2, n = 1; H3L = 4-sulfonyl-2-hydroxynaphthyl-1-azo-b-benzoyl Et acetate) were prepd. and characterized by elemental anal., IR, 1H NMR, electronic spectra and TGA measurements. Moreover, the formation consts. of the complexes were evaluated by spectroscopic techniques. The bonding of metal ions to the ligand takes place through the naphtholic and enolic OH groups by proton displacement, and through azo N, so that the complexes are octahedral.
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On the formation of manganese(II) anthranilic acid anilide complexes. Structural elucidation by TGA, IR, electronic, EPR spectra, and potentiometric studies. Abu-El-Wafa, Samy M.; El-Behairy, Mostafa A.; Issa, Raafat M.; Saleh, Akila A. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Journal of the Chemical Society of Pakistan (1988), 10(4), 464-9. CODEN: JCSPDF ISSN: 0253-5106. Journal written in English. CAN 111:166099 AN 1989:566099 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
A new series of Mn(II)-anilide complexes were prepd. and characterized by elemental anal., TGA and IR spectra. Electronic and ESR spectra indicate octahedral geometry around the Mn(II) ion, where the solvent mols. (H2O or EtOH) occupy axial positions leading to the trans structure. The stability consts. of the complexes in 50% dioxane were detd. by potentiometric techniques. The values of the conditional stability consts. depend on mol. structure. Deviation of the slopes of the s*-log K plots from unity is attributed mainly to steric effect, p-electron back donation from the metal on or structural changes in the ligand.
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Coordination chemical studies on copper(II) complexes of some derivatives of 4-hydroxy-2(1H)-quinolones. Hassanein, M.; Abu-el-Wafa, S. M.. Dep. Inorg. Chem., Natl. Res. Cent., Cairo, Egypt. Zeitschrift fuer Anorganische und Allgemeine Chemie (1989), 570 145-51. CODEN: ZAACAB ISSN: 0044-2313. Journal written in English. CAN 111:49360 AN 1989:449360 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
CuL.4H2O (H2L = I, R = COCH2COMe, R1 = Ph, Me) and [CuL1×2H2O]ClO4 (HL1 = I, R = COMe, R1 = Ph, Me, Et, R = C(Me):NNH2, R1 = Me) were prepd. and characterized by elemental anal., conductance, IR spectra and formation consts. Measurements of ligand field and ESR spectra as well as magnetic moments were also carried out. Generally, the obtained spectral results (electronic absorption energies and g values) showed that CuII ions are present in an axial elongated symmetry D4h (tetragonally distorted octahedron or square planar) depending on R. Moreover, the relatively low magnetic moment values (<1.74>mB) measured at room temp. and some calcd. G values (<4.0) style="">
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Synthesis, spectral and magnetic studies of manganese(II) and iron(III) complexes with benzoyl or salicyloyl hydrazone ligands derived from b -diketones. Abu-El-Wafa, S. M.; Gaber, M.; Issa, R. M.; Ismail, T. M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Bulletin de la Societe Chimique de France (1989), (1), 31-3. CODEN: BSCFAS ISSN: 0037-8968. Journal written in English. CAN 111:49333 AN 1989:449333 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
MnL2.nH2O [HL = o-XC6H4C(O)NHN:C(Me)CH2C(O)R (X = H, R = Me, Ph; X = OH, R = Me,Ph); n = 1, 2, 3], FeLCl2 (X = H, R = Me, Ph), FeLCl (X = OH, R = Ph), and FeLCl.2EtOH (X = OH, R = Me) were prepd. and characterized by elemental anal., conductance, IR spectra and magnetic susceptibility measurements. Electronic and ESR spectra of the solid complexes indicate tetrahedral geometry around Mn or Fe ion.
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Electroreduction of o-, m- and p-nitrobenzoic acids. Mansour, Hesham; Moustafa, H. M.; Abu-El-Wafa; Abdel-Rehman; El-Sayed; El-Din, Hanan S. Nour. Dep. Chem., Fac. Sci., Qena, Egypt. Journal of the Electrochemical Society of India (1988), 37(3), 275-7. CODEN: JESIA5 ISSN: 0013-466X. Journal written in English. CAN 110:162324 AN 1989:162324 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The redn. of o-, m- and p-nitrobenzoic acids was carried out on a Cu cathode in solns. contg. or not contg. metal cations. The electrolysis was done in 60% EtOH contg. 2N H2SO4 in a 2-compartment cell with a Cu cathode and Pt anode. The effect of freshly deposited metal was studied by the addn. of small amts. (2 mM) of either Cd2+, Zn2+, Ni2+ or Ag+. The nitro compds. were converted to the corresponding amine, sepd. as the sulfate and characterized. The current efficiencies were 24-84% depending on the nitro compd. and the added cation.
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The formation of a copper(II)-amikacin complex and its biological activity and uses. Indirect estimation of amikacin by atomic absorption spectroscopy (AAS). Abu-El-Wafa, Samy M.; El-Ries, Mohamed A.; Issa, Raafat M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Inorganica Chimica Acta (1988), 151(3), 197-200. CODEN: ICHAA3 ISSN: 0020-1693. Journal written in English. CAN 109:65803 AN 1988:465803 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[CuL(H2O)3] (H2L = amikacin) was prepd. and characterized by elemental anal., TG and spectroscopic techniques (IR, electronic and ESR spectra). The spectral results obtained indicate distorted octahedral geometry around the Cu(II) ion. The orbital redn. factors K|| and K.perp. were calcd. Amikacin can be estd. indirectly by at. absorption spectroscopy using carbonate as an auxiliary ligand. [CuL(H2O)3] shows biol. activity towards 6 organisms. Amikacin is biol. active towards Sarcina lutea, whereas [CuL(H2O)3] is biol. inactive.
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On the formation of mononuclear and binuclear complexes of pentadentate N4O2 Schiff base ligands with cobalt(II), nickel(II) and copper(II) ions: TGA, spectral and conductance studies. Aly, F. A.; Abu El-Wafa, S. M.; Issa, R. M.; El-Sayed, F. A. Fac. Sci., Menofia Univ., Menofia, Egypt. Thermochimica Acta (1988), 126 235-44. CODEN: THACAS ISSN: 0040-6031. Journal written in English. CAN 109:47279 AN 1988:447279 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Four types of complexes derived from pentadentate N4O2 Schiff base [H2SB = RCH:NNHC(O)NHN:CHR, R = o-C6H4OH, 2-hydroxy-1-naphthyl] ligands were prepd.: [M(HSB)Cl(H2O)2], [M2(SB)Cl2(H2O)5] [M = Co(II), Ni(II)] and [Cu(HSB)Cl] and [Cu2(SB)Cl2(H2O)]H2O. The isolated complexes were characterized on the basis of elemental anal., TGA, IR, electronic and ESR spectra and conductance measurements. The elec. resistivities were measured and the activation energies were calcd. The resistivities and activation energies of the complexes based on salicylidene derivs. were higher than those of complexes contg. the naphthalidene moiety.
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b -[Sodium 2-hydroxy-4-sulfonaphth-1-ylazo]acetylacetone (HNAAA) as chelating agent for alkaline earth and bivalent metal ions of the first transition series. Aly, F. A.; Abu-El-Wafa, S. M.; El-Ries, M. A. Fac. Sci., Menofia Univ., Egypt. Egyptian Journal of Chemistry (1986), Volume Date 1985, 28(6), 447-56. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 108:67681 AN 1988:67681 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[M(HNAAA)(H2O)n] {M = Ca, Mn, Fe, Co, Ni, Cu, Zn, Mg, Sr; HNAAAH2 = b-[sodium 2-hydroxy-4-sulfonaphth-1-ylazo]acetylacetone} were prepd. The complexes were subjected to elemental microanal. and characterized by IR, electronic and 1H NMR spectra, DTA and x-ray anal. The stability consts. of the complexes formed were detd. by potentiometric techniques and discussed in relation to the ionic potentials.
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Formation of metformin complexes with some transition metal ions: their biological activity. Abu-El-Wafa, S. M.; El-Ries, M. A.; Ahmed, F. H. Chem. Dep., Fac. Educ., Cairo, Egypt. Inorganica Chimica Acta (1987), 136(3), 127-31. CODEN: ICHAA3 ISSN: 0020-1693. Journal written in English. CAN 107:210877 AN 1987:610877 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
ML2 (M = Co, Ni, Cu, Zn; HL = metformin) were prepd. and characterized by elemental anal., IR, UV, 1H NMR and EPR spectra, and conductance measurements, to study their structure and geometry. Their formation consts. were evaluated by potentiometric techniques. Their biol. activity towards microorganisms was tested and compared with metformin at different concns.
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Preparation and characterization of cobalt(III) complexes of tetradentate N2O2 Schiff base ligands, IR, electronic, carbon-13 NMR, conductance, and magnetic studies. Abu-El-Wafa, Samy M.; El-Behairy, Mostafa A.; Issa, Raafat M. Fac. Educ., Ain Shams Univ., Roxy, Egypt. Bulletin de la Societe Chimique de France (1987), (3), 445-8. CODEN: BSCFAS ISSN: 0037-8968. Journal written in English. CAN 107:189476 AN 1987:589476 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[Co(SB)H2O]Z [I; H2SB = o-HOC6H4CH:NXN:CHC6H4OH-o (X = o-C6H4) or RCH:NXN:CHR (R = 2-hydroxynaphthyl, X = (CH2)2, (CH2)3, o-C6H4); Z = NO3, ClO4 or BPh4) were prepd. by air oxidn. of Co(II) salts in the presence of the Schiff bases and characterized by elemental anal., conductance measurements as well as IR, electronic and 13C NMR spectral techniques. The reaction of I with O was studied and discussed in terms of both the reaction configuration of the Co atom and the steric effects of substituents on the imine groups. I exhibit a square pyramidal structure which is supported by the results of magnetic moment measurements.
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Studies of metal chelates with phenylazo chromotropic acid dyes. Chelates of lanthanum(III), samarium(III), holmium(III) gadolinium(III), and lutetium(III) ions. Gaber, M.; Abu-El-Wafa, S. M.; Issa, R. M. Fac. Sci., Tanta Univ., Tanta, Egypt. Journal of the Chemical Society of Pakistan (1987), 9(1), 119-23. CODEN: JCSPDF ISSN: 0253-5106. Journal written in English. CAN 107:189464 AN 1987:589464 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The complexes of La, Sm, Ho, Gd and Lu with some 3-(arylazo)-chromotropic acids (aryl = 4-sulfonaphthyl, 2-carboxyphenyl, 2-arsonophenyl, 1- and 2-naphthyl) (I, II, III, IV, V, resp.) were studied by pH metric titrn., conductometric titrn. and IR spectroscopy. The metals form 1:1 and 1:2 (metal ion:ligand) complexes. The stability consts. for each metal increase in the order II < style=""> The complexes were also characterized by elemental anal. and thermogravimetric anal.
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The chelates of divalent manganese, cobalt, nickel, copper and zinc with sulfadimidine and sulfaguanidine. Abu-El-Wafa, S. M.; El-Ries, M. A.; Aly, F. A.; Issa, R. M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Pharmaceutical Sciences (1986), Volume Date 1985, 26(1-4), 7-14. CODEN: EJPSBZ ISSN: 0301-5068. Journal written in English. CAN 107:16689 AN 1987:416689 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
MLCl2.2H2O (M = Co, Ni, Mn, Cu, Zn; L = sulfaguanidine) and [ML1(OH)]2 (HL1 = sulfadimidine) were prepd. and were characterized by IR and electronic spectra, and x-ray diffraction. Both ligands are bidentate, coordinating through the sulfonyl O atom and a N atom, forming a 6-member chelate.
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Structural elucidation of the copper(II)-streptomycin complex. Indirect estimation of streptomycin by atomic absorption spectroscopy. El-Ries, M. A.; Abu El-Wafa, S. M.; Aly, F. A.; El-Behairy, M. A. Chem. Dep., Fac. Educ., Cairo, Egypt. Egyptian Journal of Pharmaceutical Sciences (1986), Volume Date 1985, 26(1-4), 1-6. CODEN: EJPSBZ ISSN: 0301-5068. Journal written in English. CAN 106:201806 AN 1987:201806 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
A Cu complex with streptomycin (I) was prepd. and characterized. Cu(II) bonds with I through the Cu-O bond. The indirect detn. of I sulfate by at. absorption spectroscopy was affected by the addn. of excess Cu2+ in slightly alk. medium and the unreacted Cu2+ sepd. as insol. carbonate. The concn. of I in its complex was then indirectly detd. from a calibration curve for std. CuSO4 solns. Beer's law was obeyed over 0.5-5 mg I.
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High-valent manganese complexes of tetradentate Schiff base ligands. ESR-active and ESR-silent dimeric species. McAuliffe, C. A.; Parish, R. V.; Abu-El-Wafa, S. M.; Issa, R. M. Inst. Sci. Technol., Univ. Manchester, Manchester, UK. Inorganica Chimica Acta (1986), 115(1), 91-4. CODEN: ICHAA3 ISSN: 0020-1693. Journal written in English. CAN 105:163811 AN 1986:563811 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[Mn(SB)(Me2CO)]Z (H2SB = o-HOC6H4CH:N(CH2)nN:CHC6H4-o-OH, n = 2, 3, and analogs derived from 3-hydroxy-2-naphthaldehyde; Z = NO3 or ClO4) were prepd. and characterized. The complexes are probably dimeric via bridging acetone ligands. Base hydrolysis of these complexes in CHCl3 yielded new dimeric species tentatively assigned as [MnIIIMnIV(SB)2(O)(OH)].H2O and [MnIV(SB)(O)]2.H2O. Elemental analyses, IR, electronic and ESR spectra, as well as cond. and room temp. magnetic susceptibility measurements are reported.
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Kinetic study of the oxidation of orcein. El-Shahat, M. F.; Abdel-Badei, M. M.; El-Sayed, A. B.; Abu El Wafa, S. M.. USA. Muslim Scientist (1984), 13(3-4), 67-74. CODEN: MUSCDX ISSN: 0148-0995. Journal written in English. CAN 105:78332 AN 1986:478332 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Rate consts. for the title oxidn. were detd. at 10-40°. Activation parameters were calcd.
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Effect of temperature on the dissociation constants of quinizarin and its complexation with iron(II). Abu-El-Wafa, Samy M.; Issa, Raafat M.; El-Zawawi, Fatma M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1985), 27(5), 665-74. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 105:42174 AN 1986:442174 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The UV spectra of quinizarin and its Fe complexes were studied in buffer soln. at various pH values. Thermodn. parameters were calcd.
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Structural elucidation of the copper(II)-streptomycin complex. Indirect estimation of streptomycin by atomic absorption spectroscopy. El-Ries, M. A.; Abu-El-Wafa, S. M.; Aly, F. A.; El-Behairy, M. A. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Analytical Letters (1985), 18(B15), 1905-13. CODEN: ANALBP ISSN: 0003-2719. Journal written in English. CAN 105:6728 AN 1986:406728 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The neutral [Cu(II)-streptomycin.4 H2O] complex was prepd. and characterized by elemental anal., TGA, IR, electronic and ESR spectra. The bonding between Cu(II) and streptomycin (I) takes place through a Cu-O bond. The indirect estn. of I sulfate by at. absorption spectroscopy is affected by the addn. of an excess of cupric ions in slightly alk. medium; the unreacted copper is sepd. as insol. carbonate. The concn. of I in its product with copper is then indirectly detd. from a calibration curve for std. copper sulfate solns.
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Spectroscopic studies on some derivatives of 4-hydroxycarbostyrils. Abu-El Wafa, S. M.; Mohamed, E. A.; Issa, R. M.; Gaber, M. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical & Analytical (1985), 24A(5), 407-11. CODEN: IJCADU ISSN: 0376-4710. Journal written in English. CAN 104:129412 AN 1986:129412 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The UV spectra of 4-hydroxycarbostyrils are related to the formation of solute-solvent mol. complexes, the formation consts. of which are detd. The pKa of the OH groups are spectrally detd. in buffer solns. The formation consts. or pKa values have LFER with s*. The IR and 1H NMR spectra of the 4-hydroxycarbostyrils are assigned.
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Studies on chelates of lanthanum(III), samarium(III), holmium(III), gadolinium(III), and lutetium(III) with arylazochromotropic acid. El Ansary, A. L.; Abu El Wafa, S. M.; Issa, Y. M. Fac. Sci., Cairo Univ., Cairo, Egypt. Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical & Analytical (1985), 24A(9), 803-4. CODEN: IJCADU ISSN: 0376-4710. Journal written in English. CAN 104:61000 AN 1986:61000 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The chelate formation reaction of La(III), Sm(III), Gd(III), Ho(III), and Lu(III) ions with some arylazochromotropic acids was studied by conductometric and pH metric titrns. The chelates formed have 1:1 and 1:2 stoichiometries (M3+:L). The complexes were isolated in the solid state and were characterized on the basis of anal. and IR data. Coordination occurs through the azo group and the phenolic O after deprotonation of the OH group, ortho to the azo linkage. The stability consts. of the complexes were detd. by pH titrns. The values obtained were correlated with the Hammett const. and ionic radii of the metal ions.
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Preparation and spectroscopic investigation of molecular complexes of N,N'-bis(benzylidene)phenylenediamines with picric acid and picryl chloride. Issa, Rafaat Moustafa; Abu-El-Wafa, Samy Mohamed; Gaber, Mohamed; Mohamed, El Hussien Aly. Fac. Sci., Tanta Univ., Cairo, Egypt. Acta Chimica Hungarica (1985), 118(2), 179-86. CODEN: ACHUDC ISSN: 0231-3146. Journal written in English. CAN 103:141384 AN 1985:541384 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The mol. complexes of some dianils with picric acid and picryl chloride were prepd. in different donor:acceptor molar ratios (1:1, 1:2, and 1:3), and examd. by IR, electronic absorption, ESR and 1H-NMR spectroscopy. The spectral changes revealed that picric acid yields mol. complexes involving p - p* and proton-transfer interactions. With picryl chloride, there is only p - p* interaction. The magnetic properties of the various complexes were also examd.
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Unusual copper(III)-Schiff's base complexes. Abu-El-Wafa, S. M.; Issa, R. M.; McAuliffe, C. A. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Inorganica Chimica Acta (1985), 99(1), 103-6. CODEN: ICHAA3 ISSN: 0020-1693. Journal written in English. CAN 102:230846 AN 1985:230846 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
[CuL(H2O)2]ClO4 [H2L = (2-HOC6H4CH:N)2Z, Z = (CH2)2, (CH2)3, (C6H4)2; (RCH:N)2Z, R = 2-hydroxynaphthyl] were prepd. by elemental anal., IR and electronic spectra. The prepd. complexes are compared with Cu(II) complexes of the same ligands. The room temp. magnetic susceptibility and the x-band EPR spectra of the 2 types of complexes showed different behavior. Cu(II) complexes were nonconducting whereas Cu(III) complexes gave a conductance corresponding to 1:1 electrolyte. This is the 1st report on the Cu(III) complexes with the tetradentate Schiff base ligands.
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New manganese(II) and copper(II) complexes of tetradentate N2O2 Schiff base ligands. Abu-El-Wafa, S. M.; Ashmawy, F. M.; Issa, R. M.; McAuliffe, C. A.; Parish, R. V. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Inorganica Chimica Acta (1985), 96(1), L25-L27. CODEN: ICHAA3 ISSN: 0020-1693. Journal written in English. CAN 102:105062 AN 1985:105062 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
MnL(H2O)2 (H2L = I, Z = (CH2)2, o-C6H4C6H4-o; H2L = o-HOC6H4CH:NZN:CHC6H4OH-o, Z = o-C6H4C6H4-o) and CuL(H2O) were prepd. and characterized by elemental anal., magnetic moment, molar cond., ESR, and IR and visible reflectance spectral methods. The H2O mols. are coordinated and L2- is tetradentate via imino N and hydroxy O. A cis monomeric structure is suggested for MnL(H2O)2 (H2L = I, Z= (CH2)2) and a polymeric structure for the other complexes.
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The composition and conditional formation constants of some transition metal ion complexes with alizarin complexone. Abu-El-Wafa, S. M.; El-Behairy, M. A.; El-Assy, N. B. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1983), 26(4), 339-42. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 101:79386 AN 1984:479386 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Formation of complexes of transition metals with alizarin complexone was studied at 30°, ionic strength 0.1 M (KNO3), in 50% aq. dioxane by potentiometric titrn. Formation consts. were calcd. by the Bjerrium method. Stability consts. were correlated with the no. of 3d electrons in the cation. Complexes with the trivalent metal ions are more stable than those with divalent ions.
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Studies of orcein and its metal complexes. I. Spectral behavior of orcein. Medium effect and ionization constants. Issa, R. M.; Abu-El-Wafa, S. M.. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Journal of the Chinese Chemical Society (Taipei, Taiwan) (1984), 31(1), 41-8. CODEN: JCCTAC ISSN: 0009-4536. Journal written in English. CAN 101:54395 AN 1984:454395 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Solvent effects on the UV spectra of orcein were studied. The 3 dissocn. consts. were detd. IR spectra and 1H NMR spectra were discussed. Mixing of orcein with transition metal ions gave drastic changes in the visible absorption spectra.
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Complexes of uranium(VI), nickel(II) and cobalt(II) with phloroglucinol in aqueous solutions. El-Inany, G. A.; Ebeid, F. M.; Abu-El-Wafa, S. M.. Fac. Educ., Ain Shams Univ., Cairo, Egypt. Egyptian Journal of Chemistry (1983), 26(2), 145-54. CODEN: EGJCA3 ISSN: 0367-0422. Journal written in English. CAN 100:162729 AN 1984:162729 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
Formation of the complexes of Co, Ni, and U with phloroglucinol in aq. soln. was studied by spectrophotometry as a function of pH and concns. of ligand and metals. Complex formation increased with increasing pH. Formation of 1:1 complexes is confirmed. Stability consts. of the complexes follow the order UO22+ > Co2+ > Ni2+. The metal ion is bonded to the ligand by replacement of the H+ from the ligand.
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Studies of C.I. Acid Red 186 ligand and metal complexes with uranyl, cerium(3+) and thorium ions. Abd-El-Kader, A. K.; Abu-El-Wafa, S. M.; Ezz-El-Arab, M. A. Fac. Sci., Al-Azhar Univ., Cairo, Egypt. Journal of the Chinese Chemical Society (Taipei, Taiwan) (1982), 30(4), 255-60. CODEN: JCCTAC ISSN: 0009-4536. Journal written in English. CAN 100:44411 AN 1984:44411 CAPLUS (Copyright (C) 2006 ACS on SciFinder (R))
Abstract
The pK values for naphthyl and pyrazolone OH groups of di-Na 4-(2-hydroxy-4-sulfo-1-naphthylazo)-3-methyl-1-(3-sulfophenyl)-5-pyrazolone (Na2H2L) and the formation consts. of UO2(Na2L)(H2O)3 and 1:2 complexes of Ce3+ and Th4+ with Na2H2L were detd. The metal complexes were isolated and characterized by elemental anal., and IR and electronic spectral methods.
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Preparation and characterization of Cu(II)--lignocaine complex. Indirect estimation of lignocaine in pharmaceutical preparations by atomic absorption spectroscopy (AAS). el-Ries M A; Abou Attia F M; Abdel-Gawad F M; Abu el-Wafa S M National Organization for Drug Control & Research, Giza, Cairo, Egypt Journal of pharmaceutical and biomedical analysis (1994), 12(9), 1209-13. Journal code: 8309336. ISSN:0731-7085. Journal; Article; (JOURNAL ARTICLE) written in English. PubMed ID 7803574 AN 95101816 MEDLINE (Copyright (C) 2006 U.S. National Library of Medicine on SciFinder (R))
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Spectroscopic studies of some Schiff bases derived from sulphonamides and their biological activity uses. el-Ries M A; Abu-el-Wafa S M; el-Kousy S M Journal de pharmacie de Belgique (1988), 43(2), 93-9. Journal code: 0375351. ISSN:0047-2166. Journal; Article; (JOURNAL ARTICLE) written in English. PubMed ID 3411431 AN 88316593 MEDLINE (Copyright (C) 2006 U.S. National Library of Medicine on SciFinder (R))
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