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Voltammetric Study of Interaction of Copper with Some Methyl-Substituted Ethylenediimine Compounds Using Nonlinear Least-Squares-Excel-Solver

Fotouhi L., Bahmanpour T., Ghasemi J., Dehghanpour S., Heravi M.

Polish Journal of Chemistry

2006

Vol. 80, nr 3

483-489

The complex formation of Cu2+ with some recently synthesized methyl-substituted ethylenediimines in binary dimethylformamide-ethanol mixtures was studied by differential pulse voltammetry. The stoichiometry and the stability of the complexes were determined by monitoring the increasing complex peak current against the ligand concentration using nonlinear least squares-Excel solver. In all studied cases, it was found that the stability of the resulting 1:1 complex decreases by increasing the amount of ethanol in the binary mixtures. The observed stability order is discussed in terms of the solvent binary mixtures and the nature of the substituted ethylenediimine structure.

Electrochemical Studies of N,N'-Bis-(beta-phenylcinnamaldehyde) Phenylenediimine in Dimethylformamide

Fotouhi L., Nazari S., Dehghanpour S.

Polish Journal of Chemistry

2005

Vol. 79 / nr 8

1327-1338

The electrochemical reduction mechanism of novel ligand N,N'-bis(_-phenylcinnamaldehyde) phenylenediimine has been investigated in the potential range -1.1 V to -2.7Von glassy carbon (GC) and mercury (Hg) electrodes. Reduction of >C=N bonds was studied in dimethylformamide using direct current (DC) voltammetry, differential pulse (DP) voltammetry, cyclic voltammetry (CV), chronoamperometry, chronocoulometry and coulometry. The studied process consists of two irreversible 2-electron transfers attributable to the reduction of azomethine bonds. The diffusion and transfer coefficients are reported. Adsorption characteristics of the molecule on a mercury electrode were studied and the maximum surface excess was found to be about 1.8x10-10 mol cm-2.