Thermodynamics of complex formation of indium metal ion with mercapto, hydroxy and amino substituted succinic acid

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Abstract

Potentiometric studies on the free ligands and the metal complexes of indium(III) with thiomalic, malic and aspartic acid have yielded stepwise protonation constant of the ligands and the formation constants of the complexes. Thermodynamic formation constants have been obtained by extrapolation of the values at various ionic concentrations. The values of overall changes in ΔG°, ΔH°, ΔS° accompanying the reactions have been evaluated at 35°. The trend in the stability constant values of indium(III) complexes has been found to be thiomalic > malic > aspartic.

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