DC-Polarography and Cyclic Voltammetric Studies of Some Mono and Bis Azo Compounds Derived from Aromatic Primary Amines and 2,3-Dihydroxynaphthalene in Aqueous Solutions

DOI : http://dx.doi.org/10.13005/msri/070203

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The DC and CV behavior of some mono and bis azo compounds based on aromatic primary amines and 2,3-dihydroxynaphthalein was investigated in Britton-Robinson buffer series. The obtained results indicated that these compounds undergo an irreversible reduction leading to cleavage of the N=N center with the formation of amine compounds. However, for the derivative m-CH3 on the aniline ring in alkaline solutions, the reduction stops at the stage for saturation of the N=N center. The E1/2 and Ep shifted to more negative potentials with rise of pH and the values of il are not much influenced except for the m-CH3 derivative. The total number of electrons involved in the reduction process was determined by controlled potential coulomety and calculated from Ilkovic equation. The effect of substituents on the electrode pathway was discussed. Based on the data obtained the electroreduction mechanism was suggested and discussed.

Azo compounds; Aromatic primary amines; DC polarography; Cyclic voltammetry