ahmedabudief

Dr. Ahmed Mohamed Abu-Dief

Professor - Professor of Physical and Inorganic Chemistry

Faculty of science

Address: Behind hospital of Sohag University - Ali Ebn Abi Taleb Street

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Kinetics of Alkaline Hydrolysis and DNA Interaction of Iron Complexes

2014 | Keywords Iron Complexes, DNA interaction, Hydrolysis, Kinetics,
Kinetics of Alkaline Hydrolysis and DNA Interaction of Iron Complexes
Air and moisture stable coordination compounds of some first transition metals such as Cr (III), VO (II), Ni(II) and Mn(II) with newly designed tri- and tetra-dentate imine ligands (HNAP, HNPN and ESPN) were synthesized. Tridentate imine ligands (HNAP, ESAP) were synthesized by reacting 2-hydroxynapthaldehyde (HN) with 2-aminophenol (AP), whereas tetra-dentate imine ligands (HNPN and ESPN) were prepared by reacting 2-hydroxy-1-napthaldehyde ... Read more

Synthesis, physicochemical studies, embryos toxicity and DNA interaction of some new Iron(II) Schiff base amino acid complexes

2013 | Keywords Fe(II) complexes, Toxicity, DNA interaction, amino acid, Schiff base,
Synthesis, physicochemical studies, embryos toxicity and DNA interaction of some new Iron(II) Schiff base amino acid complexes
New Fe(II) Schiff base amino acid complexes derived from the condensation of o-hydroxynaphthaldehyde with l-alanine, l-phenylalanine, l-aspartic acid, l-histidine and l-arginine were synthesized and characterized by elemental analysis, IR, electronic spectra, and conductance measurements. The stoichiometry and the stability constants of the complexes were determined spectrophotometrically. The investigated Schiff bases exhibited tridentate coordination mode with the general formulae [Fe(HL)2]·nH2O for ... Read more

Kinetic investigation of hydroxide ion attack at high spin Fe(II) bromosalicylidine chelates with amino acids in binary aqueous solvents: Initial and transition state analysis

2013 | Keywords Observe Rate Constant, Kinetic Investigation, base hydrolysis, EtOH, General Chemistry,
Kinetic investigation of hydroxide ion attack at high spin Fe(II) bromosalicylidine chelates with amino acids in binary aqueous solvents: Initial and transition state analysis
We have investigated the kinetics of hydroxide ion attack at iron(II) chelates with 5-bromosalicylidene derivatives of amino acids (alanine, phenylalanine, aspartic acid, histidine, and arginine) in binary aqueous mixed solvents at 298 K. The observed reactivity trends are discussed in connection with the complexes hydrophobicity/hydrophilicity, transfer chemical potentials of hydroxide ion and the complex, and the solvent effects. Read more

Novel sandwich triple-decker dinuclear NdIII-(bis-N,N′-p-bromo-salicylideneamine-1,2-diaminobenzene) complex

2013 | Keywords single-crystal X-ray study, Lanthanide complex, Schiff base, Luminescence, Magnetism,
Novel sandwich triple-decker dinuclear NdIII-(bis-N,N′-p-bromo-salicylideneamine-1,2-diaminobenzene) complex
In the search of new multifunctional molecular materials, the present paper introduces the work performed with the Salen-type Schiff base: bis-_N_,_N_′-_p_-bromo-salicylideneamine-1,2-diaminobenzene (H2bsph), to attain novel coordination complexes containing lanthanides centers (LnIII). So far, our studies have shown that the combination in acetone of the well-known H2bsph ligand, a base and NdIII(NO3)3·6H2O, results in a yellow solid which crystalline forms has ... Read more

Design, characterization, teratogenicity testing, antibacterial, antifungal and DNA interaction of few high spin Fe(II) Schiff base amino acid complexes

2013 | Keywords Schiff base, amino acid, Fe(II), Teratogenicity, DNA interaction, antibacterial, Antifungal, high spin, Design, IR,
Design, characterization, teratogenicity testing, antibacterial, antifungal and DNA interaction of few high spin Fe(II) Schiff base amino acid complexes
In this study, new Fe(II) Schiff base amino acid chelates derived from the condensation of o-hydroxynaphthaldehyde with l-alanine, l-phenylalanine, l-aspartic acid, l-histidine and l-arginine were synthesized and characterized via elemental, thermogravimetric analysis, molar conductance, IR, electronic, mass spectra and magnetic moment measurements. The stoichiometry and the stability constants of the complexes were determined spectrophotometrically. Correlation of all spectroscopic data suggested ... Read more

Design, Physicochemical Studies and DNA Interaction of Some Complexes

2013 | Keywords DNA interaction, complexes, Schiff bases, Antimicrobial activity,
Design, Physicochemical Studies and DNA Interaction of Some Complexes
In recent years, great interest has been focused on Fe(II) Schiff bases amino acids complexes as cytotoxic and antitumor drugs. Thus a series of new iron(II) complexes based on Schiff bases amino acids ligands have been designed and synthesized from condensation of 2-hydroxy-1-naphthaldehyde and 5-bromosalicylaldehyde (bs) with α-amino acids ((L-alanine (ala), L-phenylalanine (phala), L-aspartic acid (aspa), L-histidine (his) and L-arginine ... Read more

Kinetic investigation of hydroxide ion and DNA attack on some high spin iron (II) chelates Bearing ONO Donors amino acid Schiff bases

2013 | Keywords base catalyzed hydrolysis, Isomer, reaction mechanism, thermodynamic parameters, iron (II) chelates, high spin, DNA attack,
Kinetic investigation of hydroxide ion and DNA attack on some high spin iron (II) chelates Bearing ONO Donors amino acid Schiff bases
The reactivity of few novel high spin Fe(II) complexes of Schiff base ligands derived from 2-hydroxynaphthaldehyde and some variety of amino acids with OH- ion has been examined in aqueous mixture at temperature in the range 10–40 Co. Based on the kinetic investigations, the rate law and a plausible mechanism were proposed and discussed. The general rate equation was suggested ... Read more

(μ2-2,2'-(1,2-phenylenebis((nitrilo)methylylidene))bis(4-bromophenolato))-bis(2,2'-(1,2-phenylenebis((nitrilo)methylylidene))bis(4-bromophenolato))-aqua-di-neodymium chloroform solvate

2013 | Keywords bromophenolato, neodymium, imines,
(μ2-2,2'-(1,2-phenylenebis((nitrilo)methylylidene))bis(4-bromophenolato))-bis(2,2'-(1,2-phenylenebis((nitrilo)methylylidene))bis(4-bromophenolato))-aqua-di-neodymium chloroform solvate
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Design, Characterization, DNA Interaction and antimicrobial of novel copper(II) Schiff base amino acid complexes

2013 | Keywords IR, TGA, Conductivity, amino acid, novel copper(II), DNA interaction, characterization, Bromosalicylaldehyde,
Design, Characterization, DNA Interaction and antimicrobial of novel copper(II) Schiff base amino acid complexes
Five novel copper(II) complexes derived from the condensation between 5-bromosalicyaldhyde (bs) and α-amino acids (L-alanine, L-phenylalanine, L-aspartic acid, L-histidine and L-arginine) were synthesized and characterized by their elemental analyses, thermogravemetric analysis, IR, electronic spectra and conductance and magnetic measurements. Moreover, the stoichiometry and the stability constants of the prepared complexes have been determined spectrophotometrically. The Results indicated that the Schiff ... Read more

Novel Triple-Decker dinuclear Sandwich Nd (III) -(bis-N,N'-p- bromo-salicylideneamine-1,2-diaminobenzene) Complex

2013 | Keywords IR, single-crystal X-ray study, multifunctional materials, triple-decker, sandwich-shape, luminescence activity, NdIII system,
Novel Triple-Decker dinuclear Sandwich Nd (III) -(bis-N,N'-p- bromo-salicylideneamine-1,2-diaminobenzene) Complex
In the search of new multifunctional molecular materials, the present paper introduces the work performed with the Salen-type Schiff base: bis-N,N'-p-bromo-salicylideneamine-1,2-diaminobenzene (H2bsph), to attain novel coordination complexes containing lanthanides centers (LnIII). So far, our studies have shown that the combination in acetone of the well-known H2bsph ligand, a base and NdIII (NO3)3·6H2O, results in a yellow solid which crystalline forms ... Read more