Electrochemical Study of In(III) Complexes with Oxytetracycline at Dropping Mercury Electrode

Abstract

In(III)-oxytetracycline system has been studied polarographically in aqueous medium at 32 and 40°C. The reduction of In(II) is quasi-reversible, diffusion-controlled involving three electron transfer process. Potential vs. current data at μ = 0.1M(KNO₃) have been interpreted on the basis of the stepwise formation of three complex species employing Deford and Hume's method. The logarithms of stability constant (log b) of binary complexes of In(III) at 32 and 40°C are 4.8451, 9.3979 and 14.1461 and 4.6021, 9.000 and 14.1303, respectively. The values of DG, DH and DS at 40°C are also reported.