SPECIATION OF TRIMETHYLTIN(IV) - HYDROLYSIS, COMPLEXATION EQUILIBRIA,AND STRUCTURES OF TRIMETHYLTIN(IV) ION IN AQUEOUS-SOLUTION

The hydrolysis constants of trimethyl-and triethyltin(IV) ions and the stability constants for the complexation of trimethyltin(IV) with tri methylamine, N-substituted glycines (N,N-dimethylglycine and N,N,N-tri methylglycine), and aminopolycarboxylate ions (N-methyliminodiacetate, nitrilotriacetate, and ethylenediamine-N,N'-diacetate) were determine d by the potentiometric method at 25 degrees C and I = 0.1 mol dm(-3) ((H, Na)ClO4 and (H, Na)NO3). The structural parameters of Me3Sn(OH2)( 2), Et3Sn(OH2)(2), and Me3Sn(OH2)(OH) in solution were determined by t he EXAFS method. The coordination structures of trimethyltin(IV) compl exes with N-substituted glycines, trimethylamine, and aminopolycarboxy late ions are discussed on the basis of the electronic interaction bet ween the donor atom and Sn(TV).