Esam Gomaa

Mansoura University · Department of Chemistry

A series of transition metal complexes were prepared through a reaction of novel N-(benzothiazol-2-yl)-3-oxo-3-(2-(3-phenylallylidene)hydrazineyl)propanamide (H2BTOPP) ligand with divalent Co²⁺, Cu2+, and Ni²⁺ metal cations. The structures of the complexes were interpreted via several spectroscopic techniques including (FT-IR, UV-Visible, ¹H/¹³C-NM...

Scopus Author ID 2438214000 Received: 18.10.2021; Accepted: 29.11.2021; Published: 17.09.2022 Abstract: A set of conductometric measurements were conducted using zinc sulfate (ZnSO4) with different percentages of methanol (MeOH) and water in the presence of Proline (ligand) at four temperatures. The present work aims to estimate diverse thermodyn...

The cyclic voltammetry of pyridine-2,6-dicarbohydrazide (H2P) was performed in three different solutions with 0.1 M concentration of KCl, NaOH, and HCl. The pH value for the supporting electrolytes varies from acidic (4.30), alkaline (9.06), and neutral (6.96). Different cyclic voltammograms were obtained in the used media and discussed as follows:...

A series of Co²⁺, Cu²⁺ and Cd²⁺ solid chelates are prepared from pyridine-2,6-dicarbohydrazide (H2P). All compounds are elucidated by spectroscopic and microscopic techniques (IR, UV-Visible, ¹HNMR, ¹³C NMR, ESR, XRD, MS spectra, SEM and EDX). In addition, they are investigated by elemental, magnetic and thermal (TG/DTA) analyses. The Gaussian 09 p...

In this work, the effect of sulfonated naphthalene-based polymer (Sikament) on redox reactions of potassium ferrocyanide and the compressive strength of Portland Cement paste was investigated. Cyclic voltammetry of sulfonated naphthalene-based polymers with different concentrations was measured experimentally using a DY2000 potentiostat. We used KC...

This research work presents spectral characterizations (IR, ¹ H NMR and ¹³ C NMR) of anionic tellurito Cd(II) complexes that prepared using cyanopyridine derivatives as a polydentate ligands. Also, X-ray based techniques involving (EDX and XRD) are applied for cadmium complexes to realize elemental composition and average crystallographic coherence...

The Electrochemical Sensing of Nalbuphine Opioid Analgesic Drug by the Cyclic Voltammetric and Conductometric Titration Techniques

Conductivity, density and refractive index of 1-Benzyl 3- Methyl imidazolium chloride(BzMImCl)and1-Allyl 3-Methyl imidazolium Bromide(AMImBr) ionic liquids (ILs)At 298.15 K, Mixed solvents have been tested with different mole fractions of alcohols, containing aqueous and alcoholic-aqueous (methanol, ethanol and glycerol). The conductivity and surfa...

The electrochemical behavior of the complexation between copper chloride salt and succinic hydrazide can be explained using cyclic voltammetric measurements. The complex is formed through the interaction with nitrogen and hydroxyl group or carbonyl group of succinic hydrazides. This interaction can be observed by decreasing in the height peak of cu...

Thermodynamic of free and complex behaviour

Thermodynamic and conductivity parameters estimation for some ions.

Quick View ADVERTISEMENT COVID-19 Remote Access Support: Learn More about expanded access to ACS Publications research. RETURN TO ISSUEPREVARTICLENEXT Journal Logo Registered Conductometric Association Parameters for CdBr2 in the Presence and Absence of Ceftazidime in Water and 30% Ethanol–Water Mixtures Elsayed M. AbouElleef*, Mahmoud N. Abd El-...

The cyclic voltammetry data for the redox reaction for strontium chloride and calcium chloride in 0.1M KNO3 pollution were estimated. New palladium electrode was prepared and used as working electrode. Palladium electrode has already redox waves which used as analytical method for the estimation of calcium and strontium in solutions. Also, interact...

The cyclic voltammetry of both normalsized and nanosized Copper sulfate (NSCS), fluids were studied using 0.1M KCl and glassy carbon working electrode. The redox behavior for both normal and nanosized copper sulfate (NSCS) was studied voltammetrically in presence and absence of Doxorubicin (DUR) using three electrodes system, silver-silver chloride...

The polarographic behaviour of uranyl ion in maleic acid solution shows two reduction waves. The half wave potential of the first wave is shifted to more negative values in contrast to that of the second wave, which is shifted to less negative potentials on increase of the pH of the solution. The first wave represents the reduction of the 1 : 1 ura...

The solubilities of o-toluic acid have been determined in water and ethanol-water mixtures at different temperatures. From the solubility data, the values of the solubility product of o-toluic acid were calculated, and from these values, Gibbs energy for the solution processes was determined. The respective thermodynamic functions for mixing and so...

The association constant ,formation constants and Gibbs free energies are calculated from the conductometric titration curves of CuCl2 with 4-phenyl-2-diacetyl monoxime-3-thiosemicarbazone (BMPTS) in absolute ethanol at different temperatures(293.15 K , 298.15 K , 303.15 and 308.15 K). On drawing the relation between molar conductance and the ratio...

Cyclic voltammetry studies for Cu (Ⅱ) ion were carried out to show it`s redox behaviors alone in 0.1M KBr and in presence of 4-Fluoro benzoic acid. The voltammetric studies involve reversible scans at different concentration of both CuCl2 and 4-Fluoro benzoic acid (FBA). Based on the measured voltammograms the different thermodynamic parameters wer...

The molar solubilities for different samples of nickeloxide(NiO) in pure dimethylsulphoxide(DMSO) were measured at313.15,323.15 and 333.15K.The used NiOwasprepared by different methods;precipitationusing dimethyglycoxime(NDMG),stabilizing usingcitrate (Ncitrate),sol-gel(NSG) and by using urea (Nu).The samples have different morphological structure....

Different thermodynamic parameters of solvation were evaluated for the benzoic acid, orthotoluic acid, paratoluic acid, 2-chloro benzoic acid and 4-chloro benzoic acid by measuring the molal solubilities of their saturated solutions at different temperatures in binary mixtures of ethanol-water solvents. The solubility was increased when the mole fr...

Electrochemical and thermodynamic estimations of the interaction parameters for bulk and nano-silver nitrate (NSN) with cefdinir drug using glassy carbon electrode-Manuscript Draft-Manuscript Number: MCCM-D-16-00397 Full Title: Electrochemical and thermodynamic estimations of the interaction parameters for bulk and nano-silver nitrate (NSN) with ce...

Thermodynamics of complexation and solvation parameters.

Cyclic voltammetry of some salts and their interaction with some organic ligands.

The nano cadmium chloride was prepared by ball milling of normal CdCl2. The redox behavior for nano cadmium chloride was explained by Cyclic Voltammetry in the presence and absence of ligand Glycine using glassy carbon electrodes in 0.1M HCl supporting electrode. Scan rates were done for the redox behaviors for cadmium chloride in absence and in th...

The aim of this study was to determine the thermodynamics of the solvation of Pb(NO3)2in mixed propanol-H2O solvents , which is very toxic heavy metal salt at different temperatures. The Gibbs free energies as very important thermodynamic property were evaluated for Pb(NO3)2 in mixed propanol-H2O solvents at different temperature from the experimen...

The thermodynamic parameters were evaluated by the use of conductometric titrations.

The molal solubility for nano zinc oxide (ZnO) , copper (2%) doped ZnO , Fe(2%) doped ZnO , Ti(2%) doped ZnO , Ag (25) doped ZnO in 50%DMF and 50% DMSO, (v/v), volume to volume were measured at 293.15, 303.15 , 313.15, 323.15K. The thermodynamic parameters, Gibbs free energy of solvation, enthalpies and entropies of solvation were evaluated for nan...

he antimicrobial activity of Ceftazidime (CFZ) complexes was studied with nanosized cadmium chloride and nano copper sulphate salts. Firstly, preparation of the nanosized metal complexes with Ceftazidime antibiotic (CFZ) using ball milling method then, characterization were done using transmission electron microscope. Finally, the antimicrobial act...

he optical properties for nano MnSO 4 fluids like refractive index and molar refraction of different concentrations of nano manganese sulfate fluids in mixed 20% (EtOH-H 2 O) solvents were measured at four different temperatures. From the values of the measured refractive indices and their densities, the atomic, electronic polarizations, the molar...

Keywords Ceftazidime Antibiotic (CFZ), Density (d), Molar Volume (V m), Solvated Van der Waals (V w), Electrostriction Volume (V e) and Apparent Molar Volume (V Ф) ensities and apparent molar volumes for mixed (MeOH+H 2 O) and (DMSO+H 2 O) solutions of Ceftazidime antibiotic at 298.15K were reported. It was observed that, all the volumes of CFZ in...

he association constants and Gibbs free energies of association are calculated from the conductometric titration curve of CuSO 4 , NiSO 4 with ligand H 2 IH, (E)-3-(2-benzylidene hydrazinyl)-3-oxo-N-(thiazol-2-yl) propanehydrazide in ethanol solutions at 294.15K. The conductometric titration of CuSO 4 and NiSO 4 as titrant against the ligand (N'-(2...

Keywords Cyclic Voltammetry, Copper Sulfate, Glassy Carbon Electrode, Cefepime he nano copper sulfate was prepared by ball milling of normal CuSO 4. The redox behavior for nano copper sulfate was studied voltammetrically in presence and absence of Cefepime using glassy carbon electrodes in 0.1 M KCl supporting electrode. Scan rates were studied for...

203  Abstract-The molar solubility for nano zinc carbonate (ZnCO 3) in different percentages of dimethylformamide (DMF) and water were measured at 292.15, 303.15, 308.15 and 313.15 K. From the molar solubilities for nano ZnCO 3 , the solvation parameters like, activity coefficient, solubility product, free energy of solvation, enthalpy of solvatio...

The paper p r e s e n t s a s t u d y o f t h e Ph,AsPh,B assumption a s f o r v e r i f i c a t i o n o f i t s p l a u s i b i l i t y f o r t h e d e t e r m i n a t i o n o f thennodynamic q u a n t i t i e s of s i n g l e ions i n mixed d i m e t h y l s u l f o x i d e (DMS0)-water s o l v e n t s. For d i s c u s s i o n t h e sol-v a t l o...

Keywords: molar solubility, sodium oxalate, free energies of solvation, water and ethanol The molar solubility of sodium oxalate (Na 2 Ox) in mixed ethanol (EtOH)-water solvent mixtures were measured at 301.15 K. From the molar solubilities, the activity coefficients, solubility products, free energies of solvation and the transfer free energies fo...

The electrical conductivity of pure and Co-doped MgAI204 spinels was measured at 7OO-11OO K. The results of both pure and doped spinels were found to be fitted with an exponential expression with two different activation-energy parameters, in two ranges of temperature. The effect of y-irradiation on the electrical conductivity of pure and doped spi...

the microscopic charging (∆ G t charging), ion-dipole (∆ G t ion-dipole) and ion-induced dipole (∆ G t ion-induced dipole) free energies of transfer were calcu lated for some ions in mixed dimethylformamide (DM FA)-water solvents at 298.15 K. These ions are potassium, rubidiu m and caesium. These theoretical microscopic free energies were compared...

The Gibbs free energies for K 2 CrO 4 were evaluated in mixed dimethylformamide (DMF)-H 2 O solvents at 301.15 K from the experimental solubility measurements. From the experimental solubility data also the ionic radii of potassium and chromate ions are evaluated. The total free energy of the salt is divided into its individual contribution in the...

This article presents new experimental data about the conductivity and surface of Cocamidopropyl Betaine (CAPB) surfactant in pure H2O and organic–H2O mixed solvent (methanol, MeOH; ethanol, EtOH and glycerol, GlyOH) media containing various mole fractions of alcohols over the temperature range 298.15 to 313.15 K, in steps of 5 K using conductometr...

The solubility of nickel ferrite and zinc ferrite in an aqueous solution of acetic acid was studied gravimmetrically by varying the concentration of acetic acid at different temperatures ranging from 25 to 45 °C. The molar solubility and thermodynamic parameters of nano nickel and nano zinc ferrites have been evaluated. In this work, we observed ho...

Redox reaction for potassium permanganate in absence and presence of succinic acid was studied by using cyclic voltammetry in 0.1 KCl as supporting electrolyte. Glassy carbon electrode was used as working electrode, whereas the other two electrodes are Ag/AgCl/sat. KCl, reference electrode and platinum wire auxiliary electrode. The oxidation stabil...

Redox reaction for lead acetate in absence and presence of oxalic acid was studied by the use of cyclic voltammetry in 0.1M HNO3 at 302.2K. The glassy carbon electrode (GCE) was used as working electrode, whereas Ag/AgCl was used as reference electrode and platinum wire was used as auxiliary electrode. The complexation stability constants and Gibbs...

The electrochemical behavior of nickel chloride in citric acid aqueous solution (0.1M) in the presence of potassium ferrioxalate K3Fe(Oxalate)3 (KFOx) as moderator sensor and by the use of gold working electrode (GWE) was studied. Since nickel ions do not show any peaks in acidic media, but after adding potassium ferrioxalate K3Fe(Oxalate)3 (KFOx)...

Conductivity of sodium dodecyl sulfate (SDS) and sodium lauryl ether sulfate (SLES) surfactants in aqueous and in alcoholic-aqueous mixed solvents (methanol, ethanol, and glycerol) with different mole fractions of alcohols has been measured experimentally at different temperatures (298.15, 303.15, 308.15 and 313.15 K). Surface tension was also meas...

Sodium ion micro-solvated clusters, [Na(H2O) n]+, n = 1–7, were completed by (DFT) density functional theory at B3LYP/6-311+G(d,p) level in the gaseous phase. At the ambient situation, the four, five and six micro-solvated configurations can convert from each other. The investigation of the sequential water binding energy on Na+ obviously indicates...

Background Peribulbar block is considered a safe option for patients undergoing cataract surgery. The limited duration of regional eye blocks was shown to be the main problem. The objective of this study was to evaluate the effects of adjuvant midazolam (in two concentrations) to lidocaine in the peribulbar block. Material and methods This study i...

Redox reaction for CuSO4 in the absence and presence of safranin (suffranine) was studied. We applied new electrode made from multicarbon nanotubes (MCNT) and nano (Ta2O5) in a mixture with 80% MCNT and 20% (Ta2O5) by weight. Two drops paraffin oil was added, drying till dryness in tip of copper electrode covered with heat shrink polymer to do good...

Redox reaction mechanism in absence and presence of Valporic Acid (VaA) was Studied in cyclic voltammetry, we used a new silver electrode made from pure Silver piece jointed to Copper wire and isolated by heat shrink polymer to insure Complete isolation, during measurments. The Silver electrode was polished with Al 2 O 3 in woolen piece, washed and...

The electrochemical behavior was studied for CuBr 2 in the absence and presence of Succinic acid (SuA) separately in 0.1M KCl solution. The Glassy carbon electrode was prepared in our laboratory, which used as working electrode for measuring the voltammograms of CuBr 2 in 0.1M KCl at 18.7°C. Stability constant and Gibbs free energy of interaction f...

The redox mechanisms were examined for copper chloride in the absence and presence of Orange G (OG) as organic ligand at 19.1°C using carbon glassy electrode (CGE). The supporting electrolyte was 0.1 M KCl whose effect of scan rate was also studied for the redox reactions for CuCl2 alone and in the presence of the ligand, orange G (OG). Stability c...