scholarly journals Electrochemical Investigation of Some Pharmaceutical Compounds at Mercury Electrode

2018 ◽  
Vol 34 (6) ◽  
pp. 2851-2858
Author(s):  
A. A. Al-Owais ◽  
I. S. El-Hallag
Keyword(s):  
Rate Constant ◽  
Digital Simulation ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Simulation Method ◽  
Electrode Reaction ◽  
Cyclic Voltammograms ◽  
Triazole Derivatives ◽  
Aqueous Buffer ◽  
Electrochemical Parameters

The present work aims to report the investigation of the electrochemical behavior of 3- arylazomethine-1,2,4-triazole derivatives in universal aqueous buffer series at mercury electrode. The electrode behavior of the studied compounds was performed via voltammetric studies, chronoamperometry, convoluted transforms, and dp polarography techniques. The relevant chemical and electrochemical parameters of 3- aryl azomethine -1,2,4- triazole derivatives were determined experimentally in universal aqueous buffer series as supporting electrolyte at mercury electrode. CPC was used for determination of the number of electrons to elucidate the mechanistic pathway of electrode reaction of aryl azomethine triazole compounds. Digital simulation method was used to confirm the accuracy of the experimental chemical parameters (homogeneous chemical rate constant) and electrochemical parameters (heterogeneous rate constant, symmetry coefficient and redox potential) via matching between the experimental and theoretical cyclic voltammograms.

Electrochemical Studies of Some Carbazole Derivatives via Cyclic Voltammetry and Convolution – deconvolution Transforms

2011 ◽  
Vol 14 (4) ◽  
pp. 251-258 ◽  
Author(s):  
Abdullah M. Asiri ◽  
Salman A. Khan ◽  
Ibrahim S. El-Hallag ◽  
Ibrahim S. [email protected]
Keyword(s):  
Cyclic Voltammetry ◽  
Reaction Pathway ◽  
Digital Simulation ◽  
Simulation Method ◽  
Electrode Reaction ◽  
Tetraethylammonium Chloride ◽  
Cyclic Voltammetric Study ◽  
Simulation Techniques ◽  
Electrochemical Parameters ◽  
Sequential Electron

Three carbazole chromophores derivatives featuring dicyno, cyano, ethyl acetate and dimethyl acetate groups as an acceptor moiety with a ? – conjugated spacer and N-methyl dibenzo[b]pyrole as donor were investigated electrochemically at a platinum electrode in 0.1 mol/L tetraethylammonium chloride (TEACl) in acetonitrile solvent via cyclic voltammetry, convolution – deconvolution transforms and digital simulation techniques. Cyclic voltammetric study revealed that the presence of a single reversible oxidative peak due to two sequential electron transfer (EE scheme) and unidirectional reductive peak which proceed as ECEC mechanism. The electrode reaction pathway, the relevant chemical and electrochemical parameters of the investigated carbazole chromophores were determined using cyclic voltammetry, convolution- deconvolution transforms and chronoamperograms. The extracted electrochemical parameters and the nature of the electrode reaction were verified & confirmed via digital simulation method.

scholarly journals Electrochemical Properties of Charge Transfer Complexes of 4,4’-bipyridine with Benzoquinone Derivatives

2014 ◽  
Vol 17 (1) ◽  
pp. 017-021 ◽  
Author(s):  
A. A. Al-Owais ◽  
I. S. El-Hallag ◽  
L. M. Al-Harbi ◽  
E. H. El-Mossalamy ◽  
H. A. Qari
Keyword(s):  
Cyclic Voltammetry ◽  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Reaction Pathway ◽  
Digital Simulation ◽  
Simulation Method ◽  
Electrode Reaction ◽  
Charge Transfer Complexes ◽  
Electrochemical Characteristics ◽  
Electrochemical Parameters

The electrochemical characteristics of charge transfer complex of 4,4’-bipyridine with benzoquinone derivative have been investigated using cyclic voltammetry, convolutive voltammetry and digital simulation methods. Cyclic voltammetry experiments were performed at a platinum working electrode. The electrode reaction pathway, the relevant chemical and electrochemical parameters of theinvestigated complex were determined using cyclic voltammetry, convolution - deconvolution transforms. The extracted electrochemical parameters and the nature of the electrode reaction were verified & confirmed via digital simulation method.

Investigation of The Electrode Pathway of Quinoline Azo Dye Compound via Convolutive Voltammetry and Digital Simulation

2016 ◽  
Vol 19 (2) ◽  
pp. 091-095 ◽  
Author(s):  
A. Al-Owais ◽  
I. S. El-Hallag
Keyword(s):  
Cyclic Voltammetry ◽  
Azo Dye ◽  
Digital Simulation ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Alkaline Solutions ◽  
Reduction Wave ◽  
Electron Wave ◽  
Electrochemical Parameters ◽  
Ph Dependent

The electrochemical behavior and the electrode reaction of quinolone azo dye compound was investigated using convolutive cyclic voltammetry at mercury electrode in 50% (v/v) ethanolic Britton-Robinson solutions of pH 2.5 – 12.0. Four electrons slow reduction wave was consumed in acidic and alkaline solutions corresponding to the reduction of the more easily N = N center. A second more cathodic irreversible , pH – dependent, 2-electron wave represents the reduction of quinolone ring. Cyclic voltammetry and convolution transforms were used to determine the kinetic parameters of the electroactive species.The extracted electrochemical parameters were confirmed via digital simulation.Controlled potential coulometry technique was used for calculation the overall number of electrons involved in electrode reaction.

Electrochemical studies of N,N-bis pyrazinyl ­ 3,4,9,10 - perylenebis (dicarboximide) (PyPD ) on Pt electrode

2012 ◽  
Vol 16 (1) ◽  
pp. 53-57 ◽  
Author(s):  
E. H. El-Mossalamy ◽  
A. Y. Obaid ◽  
S. A. El-Daly ◽  
I. S. El-Hallag ◽  
A. M. Asiri ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Platinum Electrode ◽  
Reaction Pathway ◽  
Digital Simulation ◽  
Simulation Method ◽  
Electrode Reaction ◽  
Electrochemical Studies ◽  
Tetrabutylammonium Perchlorate ◽  
Pt Electrode ◽  
Electrochemical Parameters

The electrochemical studies of N, N – bis(pyrazinyl) – 3, 4, 9, 10 – perylene bis (dicarboximide) (PyPD) dye has been carried out on Pt electrode using cyclic voltammetry and convolution deconvolution voltammetry combined with digital simulation technique at a platinum electrode in 0.1 mol L-1 tetrabutylammonium perchlorate (TBAP) in acetonitrile solvent (CH3CN). The compound under consideration was reduced via consumption of two sequential electrons to form radical anion and dianion (EE mechanism). The electrode reaction pathway and the electrochemical parameters of the investigated compound were determined using cyclic voltammetry and convolution – deconvolution transforms. The extracted electrochemical parameters were verified and confirmed via digital simulation method.

Investigation the Electrochemical Behavior of 5-(4-Dimethylamino-benylidene)-1,3-diethyl-2-thioxodihydro-pyrimidine-4,6-dione using Semi-integration of Current

2017 ◽  
Vol 20 (2) ◽  
pp. 053-057
Author(s):  
Mohamed A. Ghanem ◽  
Ibrahim S. El-Hallag ◽  
Prabhakarn Arunachalam
Keyword(s):  
Electron Transfer ◽  
Electrochemical Behavior ◽  
Digital Simulation ◽  
Electrode Reaction ◽  
Cyclic Voltammograms ◽  
Simulation Methods ◽  
Cyclic Voltammetric ◽  
Cyclic Voltammetric Study ◽  
Voltammetric Study ◽  
Electrochemical Parameters

The electrochemical behavior of 5-(4-Dimethylamino-benylidene)-1,3-diethyl-2-thioxo-dihydro-pyrimidine-4,6-dione at a plat-inum electrode was studied by semi-integration, semi differentiation of current, and digital simulation methods in 0.1 mol/L tetra-ethylammonium perchlorate (TEACl) in acetonitrile solvent. Cyclic voltammetric study revealed that the presence of three oxidative peaks due to the presence of two electron transfer coupled by chemical reaction (EC) and followed by electron transfer (E) step then EC, i.e., the overall process is ECEEC scheme. On going to negative potential there are two unidirectional reductive peaks associated with the oxida-tive peaks. The elucidation of the electrode behavior, the electrochemical and chemical data of the compound under investigation was de-termined using sweep voltammetry, semi integration & semi differentiation of current. The calculated electrochemical parameters and the nature of the electrode reaction were established & confirmed via generation of the theoretical cyclic voltammograms.

Electrochemical studies of Schiff base compounds derived from antipyrine nucleus in ethanolic buffer solutions

2000 ◽  
Vol 78 (9) ◽  
pp. 1170-1177 ◽  
Author(s):  
Ibrahim S El-Hallag ◽  
Gad B El-Hefnawy ◽  
Youssef I Moharram ◽  
Enass M Ghoneim
Keyword(s):  
Schiff Base ◽  
Electrochemical Behaviour ◽  
Electrochemical Techniques ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Limiting Current ◽  
Electron Transfer Process ◽  
Buffer Solutions ◽  
Mechanistic Pathway ◽  
Electrochemical Parameters

The electrochemical behaviour of Schiff base compounds derived from an antipyrine nucleus was investigated in 30% (v/v) ethanolic buffer solutions (pH 3-11) using various electrochemical techniques at mercury electrode. The results showed that, the total limiting current of each of the studied compounds corresponds to 2-electron transfer process. The mechanistic pathway of the electrode reaction of the investigated compounds at mercury electrode, the effect of the medium, and the evaluation of the electrode reaction parameters were illustrated and discussed.Key words: Schiff base, antipyrine nucleus, electrode reaction, electrochemical parameters, cyclic voltammetry.

scholarly journals Voltammetric Studies of Anthracen-9-ylmethylene-(3,4-dimethyl-isoxazol-5-yl)-amine Compound at Platinium Electrode

2015 ◽  
Vol 18 (3) ◽  
pp. 177-181 ◽  
Author(s):  
A. A. Al-Owais ◽  
I. S. El-Hallag
Keyword(s):  
Cyclic Voltammetry ◽  
Radical Cation ◽  
Reaction Pathway ◽  
Digital Simulation ◽  
Electrode Reaction ◽  
Simulation Techniques ◽  
Electrochemical Parameters ◽  
Voltammetric Behavior ◽  
Voltammetric Studies

The voltammetric behavior of anthracen-9-ylmethylene-(3,4-dimethyl-isoxazol-5-yl)-amine compound at Platinium electrode has been performed via convolutive cyclic voltammetry and digital simulation techniques using a conventional platinium electrode in 0.1 mol L-1 tetrabutylammonium perchlorate (TBAP) in acetonitrile solvent (CH3CN). The compound loss one electron forming radical cation followed by fast chemical step and the radical cation loss another two electrons producing trication which followed by chemical reaction (ECEC). Cyclic voltammetry and convolutive voltammetry were used for determination of the chemical and the electrochemical parameters of the electrode reaction pathway of the investigated compound. The Electrochemical parameters such as α, ks, Eo , D, and kc of the investigated isoxazol derivative were verified via digital simulation technique. Voltammetric studies of the investigated isoxazol derivative compound under consideration was presented and discussed.

Investigation on Cyclic Reciprocal Derivative Chronopotentiometry. Part II. Theoretical Equation for an Irreversible Reaction

2000 ◽  
Vol 65 (6) ◽  
pp. 971-978 ◽  
Author(s):  
Shuping Bi ◽  
Jian Chen ◽  
Tao Chen
Keyword(s):  
Transfer Coefficient ◽  
Rate Constant ◽  
Current Density ◽  
Mathematical Analysis ◽  
Electrode Reaction ◽  
Theoretical Equation ◽  
Irreversible Reaction ◽  
Reactant Concentration ◽  
Electrochemical Parameters ◽  
Rigorous Mathematical Analysis

A rigorous mathematical analysis is presented for an irreversible electrode process in the cyclic reciprocal derivative chronopotentiometry. Influences of basic electrochemical parameters, such as transfer coefficient α, rate constant ks, current density j, number of the electrons involved in the electrode reaction n and reactant concentration c0• on the properties of the dt/dE-E chronopotentiogram are described.

scholarly journals Voltammetric and potentiometric studies of some sulpha drug-Schiff base compounds and their metal complexes

2007 ◽  
Vol 5 (3) ◽  
pp. 898-911 ◽  
Author(s):  
M. Ghoneim ◽  
E. Mabrouk ◽  
A. Hassanein ◽  
M. El-Attar ◽  
E. Hesham
Keyword(s):  
Schiff Bases ◽  
Reaction Pathway ◽  
Mercury Electrode ◽  
Transition Metal Ions ◽  
Electrode Reaction ◽  
Cyclic Voltammograms ◽  
Azomethine Group ◽  
Sulpha Drug ◽  
Controlled Potential ◽  
The Stability

AbstractThe electrochemical behavior of some sulpha drug-Schiff bases at a mercury electrode was examined in the Britton-Robinson universal buffer of various pH values (2.5–11.7) containing 20% v/v) of ethanol using DC-polarography, cyclic voltammetry and controlled-potential electrolysis. The DC-polarograms and cyclic voltammograms of the examined compounds exhibited a single, 2-electron, irreversible, diffusion-controlled cathodic step within the entire pH range which is attributed to the reduction of the azomethine group-CH=N- to -CH2-NH-. The symmetry transfer coefficient (α) of the electrode reaction and the diffusion coefficient (D 0) of the reactant species were determined. The electrode reaction pathway of the compounds at the mercury electrode was suggested to follow the sequence: H+, e−, e−, H+. The dissociation constant of the sulpha drug-Schiff bases, the stability constant and stoichiometry of their complexes with various divalent transition metal ions (Mn2+, Co2+, Ni2+, Cu2+ and Zn2+) were determined potentiometrically at room temperature.

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