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Thermodynamics of Substituted Hydrazone and Its Fe3+, UO22+, Cu2+ and Zn2+ Complexes. Potentiometric and Voltammetric Studies

. The dissociation of H2AIBuH and the stability constants of its Cu2 + complexes have been found to increase with decreasing ionic strength of the medium and increasing organic content of the aquo-organic solvent. The Gibbs free enthalpy of transfer from water to ethanol-water solvents was found to be positive and increases with increasing ethanol content. The formation of the metal complexes has been found to be spontaneous, exothermic and entropically favoured as indicated from the derived thermodynamic functions (AG, AH, AS). Polarographic and cyclic voltammetric behaviours of H2AIBuH have been investigated in Britton-Robinson buffers of pH 2 —12. The mechanism of the reaction process has been postulated. Moreover, the kinetic and the thermodynamic parameters for the electrode process have been evaluated.