omerelsheikh

omerelsheikh

مدرس - عضو هيئة تدريس

كلية العلوم

العنوان: Sohag

2

إعجاب
4 0 0 3 2 0 321 54
59

أضيف حديثا
  • المقررات الدراسية 4
  • ملحقات المقررات الدراسية 0
  • واجبات المقررات الدراسية 0
  • المنشورات و المؤلفات 3
  • ساعات مكتبية 2
  • الاعلانات 0
  • عدد الملفات المرفوعه 0
  • كل التنزيلات 0

المنشورات و المؤلفات التي تحتوي علي الكلمة المفتاحية: Hydrophilic

Synthesis, characterization and spectrophotometric studies of seven novel antibacterial hydrophilic Iron(II) Schiff base amino acid complexes

2018-11-27 22:38:26 الكلمات المفتاحية Iron(II) Schiff base complexes, Hydrophilic,
Synthesis, characterization and spectrophotometric studies of seven novel antibacterial hydrophilic Iron(II) Schiff base amino acid complexes
A series of new Iron(II) Schiff base amino acid complexes derived from the condensation of amino acid and sodium 2-hydroxybenzaldehyde-5-sulfonate have been synthesized. The complexes were characterized by elemental, electronic, IR spectral analyses and conductance measurements. The stability and solubility of the prepared complexes were determined. Two spectral methods used to determine the stoichiometry of the prepared complexes which exhibited ... إقراء المزيد

Effect of bromide salts on the acid hydrolysis of anti-bacterial hydrophilic Schiff base amino acid Iron(II) complexes

2018-11-27 23:27:24 الكلمات المفتاحية Iron(II) complexes, Hydrophilic,
Effect of bromide salts on the acid hydrolysis of anti-bacterial hydrophilic Schiff base amino acid Iron(II) complexes
Salt effects on the kinetics of acid hydrolysis of some novel hydrophilic iron(II) complexes have been investigated in aqueous medium. The ligands are derived from the condensation of amino acids (glycine, L-alanine, L-leucine, L-isoleucine, DL-methionine, DL-serine or L-phenylalanine) and sodium 2-hydroxybenzaldehyde 5-sulfonate. The reaction was studied under conditions of pseudo first order kinetics. The general rate equation was suggested as ... إقراء المزيد

Kinetics of acid hydrolysis and reactivity of some antibacterial hydrophilic Iron(II) imino-complexes

2018-11-28 14:29:32 الكلمات المفتاحية imino-complexes, Hydrophilic, antibacterial,
Kinetics of acid hydrolysis and reactivity of some antibacterial hydrophilic Iron(II) imino-complexes
Kinetic study of acid hydrolysis of some hydrophilic Fe(II) Schiff base amino acid complexes with antibacterial properties was performed using spectrophotometry. The Schiff base ligands were derived from sodium 2-hydroxybenzaldehyde-5-sulfonate and glycine, L-alanine, L-leucine, L-isoleucine, DL-methionine DL-serine, or L-phenylalanine. The reaction was studied in aqueous media under conditions of pseudo-first order kinetics. Moreover, the acid hydrolysis was studied at different ... إقراء المزيد

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 الكلمات المفتاحية 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 ... إقراء المزيد

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 الكلمات المفتاحية 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 ... إقراء المزيد

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