Acidity of carborane-carboxylic and acetic acids and 119Sn Moessbauer spectra trimethylstannyl carbaborane-carboxylates and -acetates

By the potentiometric-titration method acidities were determined of o-, m-, and p-carbaborane-monocarboxylic and -dicarboxylic acids and o-, m-, and p-carbaboraneacetic acids in acetonitrile, DMFA, and methanol. The polarographic reduction of the trimethylstannyl ''salts'' of these acids in DMFA was carried out, and also the 119Sn Moessbauer spectra of these compounds were studied. It was found that the parameters of the polarographic reduction of these salts and the quadrupole splittings in their 119Sn Moessbauer spectra are related linearly to the pKsub(α) values of the corresponding acids