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Electrochemical Studies of Indium (III) Complexes at Different Temperature by Polarographic Technique

Santosh Kumar and O. D. Gupta

Polarographic studies of In (III) complexes with L-tyrosine, citrulline, citraconic acid and hippuric acid have been carried out at two different temperatures using potassium nitrate as supporting electrolytes in aqueous medium. In all the systems, In (III) reduced quasireversibly with the involvement of three electrons. The overall formation constants were determined by DeFord and Hume's method. There was no change in the numbers of species formed by increasing the temperature from 300 K but the stability constant of complex species decreased with the rise in temperature. It was found that stability constants of In (III)-L-tyrosinate system was highest in comparison to other systems.