safa_elmasry

Safa El-masry

Teadching-Assistant - Lecturer

Faculty of science

Address: Sohag university-Faculty of science- Zoology department

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Publications Which contain the keyword: Reactivity

Kinetic and mechanistic aspects of reactivity of the oxidation of some Fe(II)–tris Schiff base complexes by peroxydisulfate: Spectrophotometric tracer and solvent effect on the reactivity

2018-11-28 00:10:23 Keywords peroxydisulfate, solvent effect, Reactivity,
Kinetic and mechanistic aspects of reactivity of the oxidation of some Fe(II)–tris Schiff base complexes by peroxydisulfate: Spectrophotometric tracer and solvent effect on the reactivity
The kinetics of the oxidation of some Fe(II)–Tris Schiff base complexes by peroxydisulfate was studied spectrophotometrically in the aqueous medium and in the organic– aqua binary mixture. The inspected complexes were derived from the condensation of 2- acetylpyridine and substituted benzylamines. The oxidation reaction of the studied complexes was followed at 303 K under pseudo–first-order conditions. It was found that ... Read more

Transfer chemical potentials, solubility and reactivity of 6-Nitro-2H-chromen-2-one and 6-Nitro-2H-chromen-2one-3-carboxylate anion

2018-10-05 11:33:12 Keywords initial state transition state, 6-Nitro-2H-chromen-2-one, Reactivity, solubility, Transfer chemical potential,
Transfer chemical potentials, solubility and reactivity of 6-Nitro-2H-chromen-2-one and 6-Nitro-2H-chromen-2one-3-carboxylate anion
Kinetic results, rate laws and reaction mechanisms were established for the base hydrolysis of 6-nitrocoumarin (NC), 6-nitrocoumarin-3-carboxylic acid (NCC), in aqueous solution, water-methanol and water-acetone mixtures. The kinetics of the base hydrolysis followed a rate law with kobs= k2[OH-] for all coumarin derivatives under study except 6-nitrocoumarin-3-carboxylic acid (NCC) which followed a rate law with kobs= k1+ k2[OH-]. The kinetic ... 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

2018-09-16 13:53:29 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

Hydrophobicity, reactivity trends of base catalyzed hydrolysis of some novel high spin Fe(II) chelates in some binary aqueous solvent mixtures: Initial-transition state analysis

2018-09-11 12:55:55 Keywords Solvent, Hydrophobic, Hydrophilic, Kinetics, Hydration, Solvolysis, Reactivity, Initial state-transition state,
Hydrophobicity, reactivity trends of base catalyzed hydrolysis of some novel high spin Fe(II) chelates in some binary aqueous solvent mixtures: Initial-transition state analysis
Rate constants for the base hydrolysis of bis(naphthylidene alanate)iron (II) (nali), bis(naphthylidene phenylalanate)iron(II) (nphali), bis(naphthylidene aspartate)iron(II) (nasi), (naphthylidene histidinate)iron(II) (nhi), bis(naphthylidene arginate)iron(II) (nari) have been reported in different binary aqueous solvent mixtures at 298 K. The observed reactivity trends are discussed in terms of the hydrophilic and hydrophobic forms of the complexes investigated, as well as the transfer chemical potentials ... 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

2018-09-11 16:51:41 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

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