Article ID Journal Published Year Pages File Type
220541 Journal of Electroanalytical Chemistry 2008 12 Pages PDF
Abstract

In this study, 1-[o-, m-, p-(chloro, bromo)]-3-(m-nitrophenyl)-5-phenylformazans were synthesized. Their structures were elucidated and spectral behaviors were investigated using elemental analysis, GC–mass, 1H NMR, 13C NMR, FTIR and UV–vis spectra. Electrochemical properties of formazans such as number of electrons transferred (n), diffusion coefficient (D) and heterogeneous rate constant (ks) of the compounds were determined and possible mechanisms were proposed with the use cyclic voltammetry, ultramicrodisc electrode and chronoamperometry. The relation between their absorption properties and electrochemical properties was sought. The redox characteristics of these compounds have been investigated in nonaqueous dimethylsulfoxide at platinum and ultramicro platinum (10 μm) electrodes. Through controlled potential electrolysis, the oxidation products of each class of compounds can be separated and identified. The oxidation mechanism is suggested and it is proved. A correlation was obtained between λmax with Hammett substituent coefficient, Eox1 and Ered1.

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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