SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF (2-OXAZOLINYLTHIENYL) TETRAORGANOTIN(IV) COMPOUNDS

The synthesis and spectroscopic characterization (Sn-119m Mossbauer and C-13/Sn-119 NMR) of a series of thienyl tetraorganotin compounds, L(n)SnR(4-n) (L = [2-(4,4-dimethyl-2-oxazolinyl)-3-thienyl]; R = CH3, n-C4H9, c-C6H11, C6H5, p-CH3C6H4 and p-ClC6H4; n = 1, 2) are described. The compounds are essentially four-coordinate structures in the solid state and in solution. An X-ray crystal structure analysis of [2-(4,4-dimethyl-2-oxazolinyl)-3-thienyl]tri(p-tolyl)tin confirms the tetrahedral geometry at tin. The oxazolinyl substituent on the thienyl ring is oriented in such a way that the oxygen atom rather than the nitrogen points towards tin at a non-bonded contact of 2.977(3) Angstrom, thus inducing a slight distortion of the tetrahedral geometry. This finding contrasts with those for LSnPh(2)Cl and LSnMe(2)(S(2)CNMe(2)), in which the oxazolinyl nitrogen is intramoIecularly coordinated to tin.