Complex formation equilibria of dimethyltin (IV) with 4-hydroxymethyl imidazole (HMI) and 2,6-dihydroxymethyl pyridine (PDC) have been investigated. Stoichiometry and stability constants for the complexes formed were determined at different temperatures and ionic strength 0.1 M NaNO3. The concentration distribution of the complexes in solution was evaluated as a function of pH. The effect of dioxane as a solvent on both the protonation constants and the formation constants of dimethyltin (IV) complexes with HMI and PDC were discussed. The thermodynamic parameters ?H0 and ?S0 calculated from the temperature dependence of the equilibrium constants were investigated.
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