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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Crystal structure of (E)-1-{[(3,5-di­methyl­phen­yl)imino]­meth­yl}naphthalen-2-ol

2015 | Keywords crystal structure, naphthalen-2-ol, imino, hydrogen bonding,
Crystal structure of (E)-1-{[(3,5-di­methyl­phen­yl)imino]­meth­yl}naphthalen-2-ol
The title compound, C19H17NO, has an _E_ conformation about the N=C bond. The mol­ecule is relatively planar, with the benzene ring and naphthalene ring plane being inclined to one another by 4.28 (10)°. There is an intra­molecular O-HN hydrogen bond generating an _S_(6) ring motif. In the crystal, mol­ecules are linked _via_ C-HO hydrogen bonds, forming chains propagating along [100]. ... Read more

Tailoring, physicochemical characterization, antibacterial and DNA binding mode studies of Cu(II) Schiff bases amino acid bioactive agents incorporating 5-bromo-2-hydroxybenzaldehyde

2015 | Keywords Intercalation, Calf thymus DNA, Cu(II) chelates, Schiff base, Amino acids,
Tailoring, physicochemical characterization, antibacterial and DNA binding mode studies of Cu(II) Schiff bases amino acid bioactive agents incorporating 5-bromo-2-hydroxybenzaldehyde
Five novel Cu(II) complexes derived from the condensation between 5-bromosalicylaldehyde (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, thermogravimetric analysis, IR, mass and electronic spectra, conductance and magnetic measurements. Moreover, the stoichiometry and the stability constants of the prepared complexes have been determined spectrophotometrically using continuous variation and molar ... Read more

A review on versatile applications of transition metal complexes incorporating Schiff bases

2015 | Keywords Complex, Schiff base, Bio-inorganic chemistry, Catalysis, Antimicrobial, Dyes, Polymers,
A review on versatile applications of transition metal complexes incorporating Schiff bases
Schiff bases and their complexes are versatile compounds synthesized from the condensation of an amino compound with carbonyl compounds and widely used for industrial purposes and also exhibit a broad range of biological activities including antifungal, antibacterial, antimalarial, antiproliferative, anti-inflammatory, antiviral, and antipyretic properties. Many Schiff base complexes show excellent catalytic activity in various reactions and in the presence of ... Read more

CuFe2O4 nanoparticles: an efficient heterogeneous magnetically separable catalyst for synthesis of some novel propynyl-1H-imidazoles derivatives

2015 | Keywords superparamagnetic materials, TEM, non-chromatographic methods, 5-Tetrasubstituted imida, recovered catalyst, efficient catalyst , Magnetic CuFe2O4 nanoparticles,
CuFe2O4 nanoparticles: an efficient heterogeneous magnetically separable catalyst for synthesis of some novel propynyl-1H-imidazoles derivatives
The non-toxic magnetic CuFe2O4 nanoparticles have been synthesized, characterized, and used as an efficient catalyst for synthesis of new derivatives for 1,2,4,5-tetrasubstituted imidazoles in excellent yields. The synthesized compounds work-up easy and purification of products are performed without chromatographic methods. The catalyst can be recovered for the subsequent reactions and reused without any appreciable loss. Read more

Electrochemical and theoretical quantum approaches on the inhibition of C1018 carbon steel corrosion in acidic medium using some newly phenolic Schiff bases compounds

2015 | Keywords Carbon steel, Schiff bases, Corrosion inhibition, SEM, Electrochemical techniques, quantum approaches,
Electrochemical and theoretical quantum approaches on the inhibition of C1018 carbon steel corrosion in acidic medium using some newly phenolic Schiff bases compounds
Two novel Schiff bases, 5-bromo-2-[(_E_)-(pyridin-3-ylimino)methyl]phenol (HBSAP) and 5-bromo-2-[(E)-(quinolin-8-ylimino)methyl]phenol (HBSAQ) have been synthesized. They have been characterized by elemental analysis and spectroscopic techniques (UV–Vis, IR and NMR). Moreover, the molecular structure of HBSAP and HBSAQ compounds are determined by single crystal X-ray diffraction technique. The inhibition activity of HBSAP and HBSAQ for carbon steel in 3.5% NaCl + 0.1 M HCl ... Read more

Kinetic study of the base-catalyzed hydrolysis of novel high-spin hydrophobic Fe(II)-azomethine amino acid chelates: Salt and structure effects on the reactivity

2015 | Keywords salt effects, Hydrophobic, Hydrophilic, Kinetics, Reactivity, reaction mechanism, base hydrolysis, aqueous solution,
Kinetic study of the base-catalyzed hydrolysis of novel high-spin hydrophobic Fe(II)-azomethine amino acid chelates: Salt and structure effects on the reactivity
The effect of salts on reactivity of basic hydrolysis of Fe(II) chelates bis(naphthylidenealanate) (nali), bis(naphthylidenephenylalanate) (nphali), bis(naphthylideneaspartate) (nasi), (naphthylidene histidinate) (nhi), bis(naphthylidene arginate) (nari) has been studied in aqueous media containing alkali metal halides, LiBr, NaCl, KBr, tetramethylammonium bromide (TMAB), tetraethylammonium bromide (TEAB), and tetrabutylammonium bromide (TBAB). The suggested mechanism of the base hydrolysis involves the parallel attack of OH−ions ... Read more

Salts and Structural Effects on the base Catalyzed Hydrolysis of some Novel and Pharmacologically Active Iron (II) Azomethine Amino Acid Complexes.

2015 | Keywords Acid-base hydrolysis, Azomethine, Kinetics, Iron(II) amino acid complexe,
Salts and Structural Effects on the base Catalyzed Hydrolysis of some Novel and Pharmacologically Active Iron (II) Azomethine Amino Acid Complexes.
The effect of salts on the reactivity of base hydrolysis of Fe (II) chelates bis (naphthylidene alanate)(nali), bis (naphthylidene phenylalanate)(nphali), bis (naphthylidene aspartate)(nasi),(naphthylidene histidinate)(nhi), bis (naphthylidene arginate)(nari) has been investigated in aqueous media containing alkali metal halides viz. LiBr, NaCl, KBr, Tetramethylammonium bromide (TMAB), Tetraethylammonium bromide (TEAB) and Tetrabutylammonium bromide (TBAB). The suggested mechanism of the base hydrolysis reaction involves ... Read more

Hydrophobicity and kinetic inspection of hydroxide ion attack on some chromen-2-one laser dyes in binary aqueous–methanol and aqueous–acetone mixtures: Initial state-transition state analysis

2015 | Keywords Initial-transition state, Base-catalyzed hydrolysis, reaction mechanism, solvent effect, Chromen-2-ones,
Hydrophobicity and kinetic inspection of hydroxide ion attack on some chromen-2-one laser dyes in binary aqueous–methanol and aqueous–acetone mixtures: Initial state-transition state analysis
In the present study, reactivity base-catalyzed hydrolysis of 7-dimethylamino-4-methyl-2H-chromen-2-one (DMAC) and 7-diethylamino-4-methyl-2H-chromen-2-one (DEAC) in binary aqueous–methanol and aqueous–acetone mixtures was examined at 298 K. Kinetic results, rate laws and reaction mechanisms were established. Moreover, the change in the activation energy barrier of the investigated compounds from water to water–methanol and water–acetone mixtures was estimated from the kinetic data. Base-catalyzed hydrolysis ... Read more

Nano structure Iron (II) and Copper (II) Schiff base complexes of a NNO-tridentate ligand as new antibiotic agents: spectral, thermal behaviors and DNA binding ability

2015 | Keywords TGA, NMR, IR, Calf thymus DNA, Antimicrobial activity, Synthesis, characterization, Nano particle, DNA interaction,
Nano structure Iron (II) and Copper (II) Schiff base complexes of a NNO-tridentate ligand as new antibiotic agents: spectral, thermal behaviors and DNA binding ability
Complexes of Fe (II) and Cu (II) with a tridentate Schiff base, 2-((z)-(pyridine-2-ylimino) methyl) naphthalene1-ol derived from 2-hydroxy-1-napthaldehyde and 2-aminopyridine were synthesized. Both the ligand and its complexes were characterized on the basis of microanalysis, melting point, 1H and 13CNMR, molar conductivity, thermal analysis, IR and UV/Vis spectral studies. From analytical data, the stoichiometry of the complexes was found to ... Read more

Recent advances in synthesis, characterization and biological activity of nano sized Schiff base amino acid M (II) complexes

2015 | Keywords DNA interaction, Antimicrobial, TEM, TGA, amino acid, Azomethine, IR, NMR,
Recent advances in synthesis, characterization and biological activity of nano sized Schiff base amino acid M (II) complexes
Azomethine amino ligands derived from the condensation of 3-methoxysalicylaldehyde (MS) or 4-diethylaminosalicylaldehyde (DS) with α-amino acids (L-phenylalanine (P) and DL-tryptophan (T)) were synthesized. All ligands were analyzed by IR, 1H NMR, 13C NMR and their melting points. Interaction of the obtained azomethine amino ligands with metal salts produced novel nano sized Fe (II) and Cu (II) complexes. The isolated complexes ... Read more