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The interaction of dimethyltin [DMT] (IV) and dioctyltin [DOT] (IV) cations with 2,2’-bipyridyl and 1,10-phenanthroline were performed potentiometrically for 1:1 systems in 10% alcohol medium at three ionic strengths (μ= 0.05, 0.10, 0.15M) and at three different temperatures 20°C, 30°C, 40°C. The experimental data are subjected to computational analysis in order to evaluate thermodynamic formation constants [ML, ML(OH) and ML(OH)2] and other thermodynamic parameters (∆G° , ∆H° and ∆S° ). A stability constant of generalized species (SCOGS) computer program was employed for computation. The concentration distribution of the various complex species in solution has been evaluated as a function of pH and is presented in the form of speciation curves. The studies intimate that 2,2’-bipyridyl formed complexes of low stability than 1,10-phenanthroline. This is attributed to the difference in ring structure of two ligands.

Potentiometric Studies on Complexation Equilibria between Dimethyltin (IV) and Dioctyltin (IV) Cations with N-N Donor Ligands