Abstract
Thermoydnamic protonation constants of N-phenylthiovioluric and [PTVA], N-p-tolylthiovioluric acid [ p-to-TVA], N-o-tolylthiovioluric acid [ o-to-TVA] and N-m-tolylthiovioluric acid [ m-to-TVA] and thermodynamic formation constants of the chelates of Cu 2+, Co 2+, Ni 2+, Zn 2+, Fe 2+ and Mn 2+ with these four closely related N-arylthiovioluric acids have been determined at three different temperatures in 80% v/v water-dioxane solvent. The stabilities of complexes follow the order of basicities of ligands and also the electron affinities of bivalent metal ions as measured by their overall ionisation potential. Other factors affecting complex stability of the metal ions were discussed. The stepwise complexation is found to be predominantly enthalpy driven processes.
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