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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Doping of Nano Cobalt Ferrites by Cupper: Structural and Magnetic Properties Studies

2015 | Keywords EDAX, XRD, particle size, Magnetic properties, structural, Cobalt Ferrites, Doping, TEM, SEM, FT-IR,
Doping of Nano Cobalt Ferrites by Cupper: Structural and Magnetic Properties Studies
A series of Cupper-substituted cobalt nano ferrites (CuxCo1-x Fe2O4 with = 0.00, 0.10, 0.20, 0.30 and 0.4) was synthesized via hydrothermal method. The structural characterizations of all the prepared nanoparticles were performed using powder x-ray diffraction, EDAX and FTIR analyses. These studies confirmed the formation of single-phase spinel structure in at lower compositions. The increase in the value of lattice ... Read more

Effect of Europium Substitution on the Structural and Magnetic Properties of Nanocrystalline Cobalt Ferrite

2015 | Keywords Doping, Oxides, Chemical synthesis, Electron microscopy, Magnetometer, EDAX,
Effect of Europium Substitution on the Structural and Magnetic Properties of Nanocrystalline Cobalt Ferrite
A series of Europium-substituted cobalt ferrites (CoEuxFe2-xO4 with = 0.00, 0.10, 0.20, 0.30) were synthesized by hydrothermal method. The structural characterizations of all the prepared samples were done using XRD and FTIR. These studies confirmed the formation of single-phase spinel structure in all the compositions. The increase in the value of lattice parameter with increase in Europium concentration suggests the ... Read more

Doping of Nano Zinc Ferrites by Chromium: Structural and Magnetic Properties Studies

2015 | Keywords Doping, TEM, SEM, XRD, superparamagnetic materials, Ferrites, VSM,
Doping of Nano Zinc Ferrites by Chromium: Structural and Magnetic Properties Studies
A SERIES OF CHROMIUM-SUBSTITUTED ZINC FERRITES (CRXZN FE2-XO4 WITH = 0.00, 0.10, 0.20, 0.30, 0.40) WERE SYNTHESIZED VIA HYDROTHERMAL METHOD. THE STRUCTURAL CHARACTERIZATIONS OF ALL THE PREPARED SAMPLES WERE DONE USING XRD, FTIR AND EDAX, TEM, HR-TEM AND TGA MEASUREMENTS . THESE STUDIES CONFIRMED THE FORMATION OF SINGLE-PHASE INVERSE SPINEL STRUCTURE IN ALL THE COMPOSITIONS. FROM HR-TEM MEASURMENTS, CRYSTALLINITY ARE ... Read more

Complexation of Schiff bases incorporating of Salicylaldehyde Derivatives and Amino Acids to Copper(II) as an effective strategy for antimicrobial activity improvement, DNA Interaction and catalytic activity

2015 | Keywords Antimicrobial activity, DNA interaction, Amino acids, Catalytic activity, Copper(II), TGA, IR,
Complexation of Schiff bases incorporating of Salicylaldehyde Derivatives and Amino Acids to Copper(II) as an effective strategy for antimicrobial activity improvement, DNA Interaction and catalytic activity
Five Cu(II) complexes are tridentate Schiff bases amino acids ligands derived from condensation 3–methoxysalicylaldehyde (MS) or 4-diethylaminosalicylaldehyde (DS) with α-amino acids (L-phenylalanine(P), L-histidine (H), DL-tryptophane (T)). All ligands are analyzed by 1HNMR and 13CNMR. The investigated complexes have been prepared and characterized by elemental analysis, infrared spectra, ultraviolet-visible and thermal analysis in dynamic air atmosphere (40ml / min) at a ... Read more

Approach to Synthesis, Characterization, Antimicrobial Activities and Catalytic Activity of Some Transition Metal Complexes Containing Biologically Active Asymmetrical Tetradentate Ligands.

2015 | Keywords Catalytic activity, Antimicrobial Activities, Tetradentate Ligands, DNA interaction, IR, NMR, TGA,
Approach to Synthesis, Characterization, Antimicrobial Activities and Catalytic Activity of Some Transition Metal Complexes Containing Biologically Active Asymmetrical Tetradentate Ligands.
AIR AND MOISTURE STABLE COORDINATION COMPOUNDS OF FIRST TRANSITION METALS SUCH AS CO(II), NI(II) AND CU(II) WITH NEWLY DESIGNED SCHIFF BASE (BSIPH) INCORPORATING 5-BROMOSALICYALDEHYDE WITH ISATIN AND 4-NITRO-O-PHENYLENE DIAMINE HAVE BEEN SYNTHESIZED TO ELUCIDATE THE STRUCTURE OF METAL COMPLEXES. THEY ARE CHARACTERIZED BY ELEMENTAL ANALYSES, INFRARED, 1HNMR, 13CNMR, THERMAL ANALYSIS, UV-VISIBLE, CONDUCTIVITY AND MAGNETIC SUSCEPTIBILITY MEASUREMENTS. THE RESULTS SUGGEST THAT ... Read more

Green Synthesis of AgNPs() Ultilizing Delonix Regia Extract as Anticancer and Antimicrobial Agents

2015 | Keywords AgNPs,
Green Synthesis of AgNPs() Ultilizing Delonix Regia Extract as Anticancer and Antimicrobial Agents
Silver is an effective antimicrobial agent with low toxicity, which is important especially in the treatment of burn wounds where transient bacteremia is prevalent. In this research, the green method was employed to synthesis silver nanoparticles (AgNPs). The synthesized AgNPs were characterized using IR, XRD, DLS and UV/Visible Spectrophotometery. XRD pattern of AgNPs has a face‐centered cubic (FCC) form and ... Read more

Kinetic study of the hydroxide ion attack on and DNA interaction with high spin iron(II) Schiff base amino acid chelates baering ONO donors

2014 | Keywords Substituent effect, base catalyzed hydrolysis, Reactivity, reaction mechanism, thermodynamic parameters, DNA interaction,
Kinetic study of the hydroxide ion attack on and DNA interaction with high spin iron(II) Schiff base amino acid chelates baering ONO donors
Kinetic study of some novel high spin Fe(II) complexes of Schiff base ligands derived from 5-bromsalicyaldehyde and amino acids with the OH− ion and DNA has been carried out. Based on the kinetic data, the rate law and a plausible mechanism were proposed. Kinetic data of the base catalyzed hydrolysis imply pseudo first-order double stage process due to the presence ... Read more

Reactivity Trends and Kinetic Inspection of Hydroxide Ion Attack and DNA Interaction on Some Pharmacologically Active Agents of Fe(II) Complexes at Different Temperatures

2014 | Keywords Activation energy barrier, DNA interaction, Amino acids, high-spin Fe(II) complexe, Kinetic Inspection, Temperature,
Reactivity Trends and Kinetic Inspection of Hydroxide Ion Attack and DNA Interaction on Some Pharmacologically Active Agents of Fe(II) Complexes at Different Temperatures
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 the OH− ion has been examined in an aqueous mixture at the temperature range from 10 to 40°C. Based on the kinetic investigations, the rate law and a plausible mechanism were proposed and discussed. The general rate equation ... Read more

Kinetic study and reactivity trends of hydroxide ion attack on some chromen-2-one laser dyes in binary water-methanol and water-acetone mixtures

2014 | Keywords chromen-2-one, DMAC, base hydrolysis, DEAC, Reactivity Trend,
Kinetic study and reactivity trends of hydroxide ion attack on some chromen-2-one laser dyes in binary water-methanol and water-acetone mixtures
The kinetics of base-catalyzed hydrolysis of 7-dimethylamino-4-methyl-2_H_-chromen-2-one (DMAC) and 7-diethylamino-4-methyl-2_H_-chromen-2-one (DEAC) in binary water-methanol and water-acetone mixtures were studied in the temperature range from 288 to 313 K. The activation and thermodynamic parameters of these reactions were evaluated and discussed. The change in the activation energy in going from water to aqueous methanol and aqueous acetone was estimated from the ... Read more

Metal based pharmacologically active agents: Synthesis, structural characterization, molecular modeling, CT-DNA binding studies and in vitro antimicrobial screening of iron(II) chelates

2014 | Keywords amino acid, TGA, Antimicrobial, Gel electrophoresis, Calf thymus DNA, Molecular modeling, Fe(II) chelates, Schiff bases,
Metal based pharmacologically active agents: Synthesis, structural characterization, molecular modeling, CT-DNA binding studies and in vitro antimicrobial screening of iron(II) chelates
In recent years, great interest has been focused on Fe(II) Schiff base amino acid 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 5-bromosalicylaldehyde (bs) and α-amino acids (l-alanine (ala), l-phenylalanine (phala), l-aspartic acid (aspa), l-histidine (his) and l-arginine (arg)). The ... Read more