The Synthesis and Structural Studies of some Dialkyltin(IV) Salts of Strong Monobasic Acids

Abstract

A number of dialkyltin(IV)-bisfluorosulfates, -bistrifluoromethanesulfonates, and -bisdifluorophosphates are synthesized by solvolysis of dialkyltin(IV) chlorides in an excess of the corresponding acid according to [Formula: see text] R = CH3, C2H5, n-C3H7, n-C4H9, and n-C8H17; X = SO3F, SO3CF3, and PO2F2. The structural proposals, hexacoordination for tin with the alkyl groups in trans-octahedral position and bidentate bridging anionic groups with coordination through oxygen, are based on 119Sn Mössbauer, infrared and, where obtainable, Raman spectra. The vibrational spectra of the difluorophosphates are discussed in detail. Variations in isomer shift and quadrupole splitting values with different alkyl groups in all three groups of compounds follow the same regular pattern as in the series R2SnF2. The results of point charge calculations are reported.