MOSSBAUER, MULTINUCLEAR MAGNETIC-RESONANCE AND MASS-SPECTROMETRIC STUDIES OF ORGANOTIN CARBOXYLATES OF M-METHYL TRANS-CINNAMIC ACID

The synthesis and spectroscopic characterization (H-1, C-13, Sn-119 NM R, Sn-119m Mossbauer and mass spectrometry) of a series of organotin c arboxylates of m-methyl trans-cinnamic acid are described. Different l iterature methods have been successfully applied for the qualitative s tructural characterization of these compounds. Triorganotin carboxylat es are essentially penta-coordinate in the solid state with R(3)SnO(2) geometry, while tetracoordinate in non-coordinating solvents. Diorgan otin carboxylates with a 1:2 molar ratio (R(2)SnO:2HOCOR') are hexa-co ordinate as solids, while there is an equilibrium between hexa- and pe nta-coordinated states in solution. Moreover, compounds with a 1:1 mol ar ratio (R(2)SnO:HOCOR'), adopt a characteristic tetraorganodicarboxy lato distannoxane structural mode. Interesting results have been obser ved for tricyclohexyltin derivatives and stannoxanes. 2D NMR has been employed for the assignments of protons of high-spin systems.