Abstract
The synthesis and spectroscopic characterization ( 1H, 13C, 119Sn NMR, 119mSn Mössbauer and mass spectrometry) of a series of organotin carboxylates of m-methyl trans-cinnamic acid are described. Different literature methods have been successfully applied for the qualitative structural characterization of these compounds. Triorganotin carboxylates are essentially penta-coordinate in the solid state with R 3SnO 2 geometry, while tetracoordinate in non-coordinating solvents. Diorganotin carboxylates with a 1:2 molar ratio (R 2SnO: 2HOCOR′) are hexa-coordinate as solids, while there is an equilibrium between hexa- and penta-coordinated states in solution. Moreover, compounds with a 1:1 molar ratio (R 2SnO: HOCOR′), adopt a characteristic tetraorganodicarboxylato distannoxane structural mode. Interesting results have been observed for tricyclohexyltin derivatives and stannoxanes. 2D NMR has been employed for the assignments of protons of high-spin systems.
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