khalaf.ali

Khalaf Ali Fayez Abuamra

استاذ - أستاذ متفرغ

كلية العلوم

العنوان: قسم النبات والميكروبيولوجى -كلية العلوم -جامعة سوهاج

2

إعجاب

المنشورات و المؤلفات التي تحتوي علي الكلمة المفتاحية: solvent effect


2019-08-31 09:23:40 الكلمات المفتاحية Spectroscopic titration, solvent effect, DFT Calculations, Chemo-sensors, Azomethine,
Design, Synthesis and Structural Inspection of Some Novel Di- And Tri-Azomethene Compounds as Chemo Sensors for the Detection of Various Metal Ions
In this study, NBA imine compound was synthesized via an easy one-pot condensation of 3-nitro-benzaldyhide with 2-amino benzoic acid in 1:1 ratio and DAPH imine compound derived from 2,6-diacetyl pyridine and phenyl hydrazine hydrochloride. Consequences of the newly synthesized compounds hooked up with the aid of FT-IR, elemental analyses, 13C-NMR ,1H-NMR and digital spectral research. Experiments had been consistent with ... إقراء المزيد

2019-08-02 08:00:28 الكلمات المفتاحية receptor, solvent effect, DFT Calculations, Chemosensors, Azomethine,
Development Of Some Novel Azomethine Compounds As Chemo Sensors
Heavy metal pollution possess a great potential threat to the environment and has its own damaging effects to plants, animals and ultimately to human health, because of its release into the environment and water bodies results in a variety of illnesses related with the risk of dermal damage, respiratory problems and several kinds of cancer. On the other hand, the ... إقراء المزيد

2019-01-21 11:30:20 الكلمات المفتاحية Spectroscopic titration, solvent effect, DFT Calculations, Azomethine, Chemosensors,
Novel Di- and Tri-azomethine Compounds as Chemo Sensors for the Detection of Various Metal Ions
In this study, HNA imine compound was synthesized by a simple one-pot condensation of 2-hydroxy-1-naphthaldhide with 2-amino benzoic acid in 1:1 ratio and HNAP imine compound derived from 2-hydroxynaphthaldhide and 3-amino pyridine. Results of the newly synthesized compounds established by elemental analyses, FT-IR, 1H-NMR, 13C-NMR and electronic spectral studies experiments were consistent with their chemical structures. The theoretical DFT calculations ... إقراء المزيد

2018-11-28 23:13:30 الكلمات المفتاحية solvent effect, coumarin ,
Solvent Effects on The Reactivity Trends of Some Coumarin Derivatives
Solvent Effects on The Reactivity Trends of Some Coumarin Derivatives Coumarins have attracted intense interest in recent years because of their diverse pharmacological properties. Among these properties, their cytotoxic effects were most extensively examined, their broad range of effects on the tumors as shown by various in vitro and in vivo experiments. Coumarins have important effects in plant biochemistry and ... إقراء المزيد

2018-08-29 20:27:34 الكلمات المفتاحية Solvent; kinetics; rate; hydration; hydr, binary mixtures, solvent effect,
Hydrophobicity and reactivity of base hydrolysis of some novel low spin Fe(II) amino acid Schiff base complexes in some binary aqueous solvent mixtures
Rate constants for base hydrolysis of bis(naphthylidene isoleucinate)iron (II) (nili), bis(naphthylidene leucinate)iron(II) (nli), bis(naphthylidene serinate)iron(II) (nsi), bis (salicylidene isoleucinate)iron(II) (sili), (salicylidene leucinate)iron(II) (sli), bis(salicylidene methioninate)iron(II) (smi), and (salicylidene tryptophanate)iron(II) (sti) have been reported in different binary aqueous mixtures at 298 K. The observed reactivity trends are discussed in terms of the hydrophilic and hydrophobic forms of the complexes investigated, as ... إقراء المزيد

2018-11-28 00:10:23 الكلمات المفتاحية 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 ... إقراء المزيد

2018-08-30 19:39:42 الكلمات المفتاحية Kinetics, Activation energy barrier, solvent effect, base hydrolysis mechanism, Hydroxy-chromen-2-ones,
Kinetics of base hydrolysis of some chromen-2-one indicator dyes in different solvents at different temperatures
Base hydrolysis of 7-hydroxy-2H-chromen-2-one (HC) and 7-hydroxy-2H-chromen-2-one-4-acetic acid (HCA) in aqueous-methanol and aqueous-acetone mixtures were studied kinetically at temperature range from 283 to 313 K. The activation parameters of the reactions were evaluated and discussed. 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. ... إقراء المزيد

2018-11-21 12:16:31 الكلمات المفتاحية Catalyzed, H2O2, Selectivity, tetra-dentate, epoxidation, Cyclooctene, solvent effect, Temperature, TON, TOF,
High Selectivity on The epoxidation of Cyclooctene Catalyzed by Tri-and Tetra-Dentate Imine Vanadyl Chelates Using H2O2
High yield of VO(II) chelates incorporating new imine ligands were obtained by the condensation reaction between 2-hydroxynaphthaldehyde or 3-ethoxysalicylaldehyde and o-phenylenediamine s in 1:1 molar ratio. All the complexes are non– hygroscopic in nature and stable to the atmosphere. The synthesized ligands and the isolated imine chelates have been characterized various physico-chemical techniques. The results obtained from these studies and ... إقراء المزيد

2018-11-18 11:43:13 الكلمات المفتاحية Temperature, solvent effect, tetra-dentate, Cr (III) complexes, catalytic oxidation, IR, NMR, TGA, aqueous-methanol, Oxidation,
Some New Cr (III)  Mononuclear Complexes encompassing Tri- and Tetra-dentate Imine Ligands: Synthesis, Spectral Characterization and High Selectivity in Catalytic Oxidation of Benzyl alcohol
IN THE PRESENT CONTRIBUTION, SOME NOVEL CR (III) COMPLEXES WERE SYNTHESIZED FROM TRI- AND TETRA-DENTATE IMINE LIGANDS DERIVED FROM 3-ETHOXYSALICYLALDEHYDE OR 2-HYDROXYNAPHTHALDEHYDE WITH 2-AMINOPHENOL OR O-PHENYLENEDIAMINE. ALL THE PREPARED LIGANDS WERE AUTHENTICATED BY 1H, 13C NMR AND IR SPECTRA. INTERACTION OF THE SYNTHESIZED LIGANDS WITH CHROMIUM NITRATE PRODUCED THREE NOVEL CR(III) COMPLEXES. THE STRUCTURE OF THE PREPARED CR (III) COMPLEXES ... إقراء المزيد

2018-11-18 11:22:30 الكلمات المفتاحية solvent effect, Kinetics, methanol, acetone, base hydrolysis,
Kinetics, Reactivity, Initial–Transition State Analysis and Thermodynamic Parameters of Base-Catalyzed Hydrolysis of Coumalic Acid in Solvents of Different Polarities
Base-catalyzed hydrolysis of coumalic acid (COU) in aqueous-methanol and aqueous-acetone mixtures has been studied kinetically at temperature range from 283 to 313 K. Moreover, the change in the activation energy barrier of COU from water to water–methanol and water–acetone mixtures is estimated from the kinetic data. Solvent effects on reactivity trends have been analyzed into initial and transition state components. ... إقراء المزيد