A. M. Abdallah

Mansoura University, El-Manṣûra, Ad Daqahlīyah, Egypt

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Publications (10)29.69 Total impact

  • T. H. Rakha · K. M. Ibrahim · A. M. Abdallah · M. M. Hassanian
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    ABSTRACT: The complexes of Co(II), Ni(II), Cu(II), Pd(II), Cd(II) and Zn(II) with hydrazones derived from benzoic, p-methylbenzoic or p-nitrobenzoic acid hydrazides and pyrrole-2-carboxaldehyde have been synthesized. The complexes have been characterized by elemental analyses, molar conductance, spectral (IR and visible) and magnetic studies. All the complexes are non-electrolytes. The IR spectral data show that the ligands act as neutral or monoanionic bidentates or as monoanionic tridentates. Spectral and magnetic studies suggest octahedral structures for all Co(II) and Ni(II) complexes, square-planar structures for [Cu(PBH)2], [Cu(PMBH)2].H2O and all Pd(II) complexes and a tetragonally distorted octahedral structure for [Cu(PNBH)2].
    Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 08/2006; 26(7):1113-1123. DOI:10.1080/00945719608004355
  • A.A. El-ASMY · M E Khalifa · T H Rakha · M M Hassanian · A M Abdallah
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    ABSTRACT: Complexes of several transition metal ions with alpha-oximinoacetoacetyl pyridine-4-phenylthiosemicarbazone (H3OAPT) have been prepared. Attempts were made to elucidate their geometries by elemental analysis, molar conductance, magnetic measurements and by some spectroscopic (IR, ESR and electronic) techniques. All the investigated metal ions form mononuclear complexes except for CuII, which forms mononuclear and trinuclear complexes with its chloride and acetate salts, respectively. The IR spectra show that the ligand behaves as a mono or binegative tridentate. Moreover, it acts as a trinegative hexadentate in the trinuclear CuII complex. The protonation constants (logK1H = 9.9 and log K2H = 6.0), as well as the stability constants of the metal complexes, are determined by the pH-titration of H3OAPT and its metal(II) complexes against 0.01 M NaOH. CuII complexes possess square-planar stereochemistry while CoII and NiII have an octahedral one. The crystal field parameters of CoII and NiII complexes are evaluated.
    CHEMICAL & PHARMACEUTICAL BULLETIN 02/2000; 48(1):41-4. DOI:10.1248/cpb.48.41 · 1.16 Impact Factor
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    ABSTRACT: New transition metal complexes of Co, Ni, Cu and Fe with butylmalonylbis(4-phenylsemicarbazide), H4BMPS, have been synthesized chemically and electrochemicaly. Attempts have been made to ascertain their probable structures on the basis of elemental analyses, molar conductivity, spectra (IR, electronic and H NMR) and magnetic measurements. IR data show that H4BMPS acts as a bidentate or hexadentate (with two metal ions) ligand coordinating via different modes. The stereochemistry of the Co, Ni, Cu and Fe complexes was investigated with the help of magnetic and spectral studies. The crystal field parameters calculated for the Co and Ni complexes agree fairly well with that reported for known octahedral complexes. [Co2(BMPS)(H2O)4] has a trigonal bipyramidal structure while [Ni2(BMPS)(H2O)4] has mixed stereochemistry.
    Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 02/1996; 26(2-2):245-262. DOI:10.1080/00945719608004261
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    ABSTRACT: The determination of tin in the presence of a variety of metal ions has been studied by hydride generation atomic absorption spectrometry. The results show serious depressing interference from transition metals. Such interference can be completely eliminated using potassium cyanide. A mechanism is put forward to interpret the effect of cyanide via the formation of a stable cyano-metal complex with te interfering metal before the harmful depressing effect of the latter takes place in the quartz cell.
    Journal of Analytical Atomic Spectrometry 01/1993; 8(5). DOI:10.1039/ja9930800759 · 3.47 Impact Factor
  • Amin M. Abdallah · Magdy E. Khalifa · Magda A. Akl
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    ABSTRACT: The formation of complexes between orthophosphate and alizarin red sulphonate (ARS) has been ascertained. One or two kinds of complexes are formed in solution according to the pH of the medium with PO3−4:ARS ratios of 1:3 and 1:2 at pH 6.6 and 8.3 with formation constants of 2.97 × 1020 and 1.3 × 109 at λmax 478 and 520 nm, respectively. The development of the 1:3 complex was utilized for the determination of orthophosphate with a working concentration range of 0.03–6.00 μg ml−1 phosphorus (ϵ = 1.14 × 104 l mol−1 cm−1 at 478 nm). The interference of some anions and cations was investigated. Structures of the isolated solid complexes are suggested based on elemental analysis and infrared spectrophotometric measurements. A procedure for the determination of different forms of phosphorus has been elaborated and applied to differentiate between non-organic and organically bound phosphorus in re-used water effluents.
    Analytica Chimica Acta 10/1991; 251(1-2):207-213. DOI:10.1016/0003-2670(91)87138-W · 4.51 Impact Factor
  • M. M. El-Defrawy · M. E. Khalifa · A. M. Abdallah · M. A. Akl
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    ABSTRACT: A number of ions affect the absorbance of magnesium, calcium and strontium in a fuel-rich air-acetylene flame and this effect is removed by the presence of catechol or pyrogallol. An investigation of the removal of the interfering effect of silicate or phosphate using the continuous titration technique revealed a stoicheiometric relationship due to the formation of anionic complexes between pyrogallol and silicate or phosphate, i.e., 4 : 1 and 3 : 1, respectively. This stoicheiometry has been confirmed by spectrophotometric measurements.
    Journal of Analytical Atomic Spectrometry 04/1987; 2(3). DOI:10.1039/ja9870200333 · 3.47 Impact Factor
  • M.M. El-Defrawy · A.M. Abdallah · A.F. El-Asmy
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    ABSTRACT: A variety of ligands affects the absorbance of copper, zinc and cadmium in the air/aceetylene flame. This effect is removed by the addition of 0.1 M potassium cyanide.
    Analytica Chimica Acta 12/1985; 174:343-346. DOI:10.1016/S0003-2670(00)84397-4 · 4.51 Impact Factor
  • A. M. Abdallah · M. M. El-Defrawy · M. A. Mostafa · A. B. Sakla
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    ABSTRACT: The effect of anions on molybdenum absorbance depends on the pH; low pH causes the formation of iso- or heteropoly anions which change the atomization process in the flame. Organic ligands also depress the release of molybdenum atoms but cyanide radicals in the flame scavenge, e.g., OH radicals from such ligands and prevent their depressive effect. Certain cations (La, Ce, Mg, Ca, Sr and Ba) appear to form spinels; boric acid minimizes this effect.
    Analytica Chimica Acta 12/1985; 174:347-352. DOI:10.1016/S0003-2670(00)84398-6 · 4.51 Impact Factor
  • A.M. Abdallah · M.M. El-Defrawy · M.A. Mostafa · A.B. Sakla
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    ABSTRACT: The inhibition-release titration method has been used to study interference effects in flame atomic-absorption determination of iron. Interferences from anions, cations and complexing agents with the atomic-absorption of iron when a stoichiometric air-acetylene flame is used, can be obviated by a preliminary treatment of the sample solution with sulphosalicylic acid to convert the iron into the same complex before aspiration, thus giving a constant environment for the iron in the flame processes.
    Talanta 02/1985; 32(1):19-22. DOI:10.1016/0039-9140(85)80007-2 · 3.55 Impact Factor
  • A.M. Abdallah · M.M. El-Defrawy · M.A. Mostafa
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    ABSTRACT: In the atomic absorption spectrometric determination of chromium(III), the interfering effects of different complexing agents can be completely eliminated by addition of excess of cyanide, boric acid or sulphosalicyclic acid. The effect of some complexing agents on the production of chromium atoms is discussed, and the mechanism of cyanide interaction is investigated in detail.
    Analytica Chimica Acta 12/1984; 165(165):105-111. DOI:10.1016/S0003-2670(00)85190-9 · 4.51 Impact Factor