PREPARATIONS AND CRYSTAL-STRUCTURES OF SN(CH(2)CH(2)CO(2)ME)(2)(C3S5)AND [Q][SN(CH(2)CH(2)CO(2)ME)(C3S5)(2)] (Q=NET(4) OR 1,4-DIMETHYLPYRIDINIUM, C3S5=4,5-DISULFANYL-1,3-DITHIOLE-2-THIONATE)

The compounds Sn(CH(2)CH(2)CO(2)Me)(2)(C3S5) 1 (R = Me or Pr-1) and [Q ][Sn(CH(2)CH(2)CO(2)Me)(C3S5)(2)] 2 (Q = NEt(4) or 1,4-dimethylpyridin ium; C3S5 = 4,5-disulfanyl-1,3-dithiole-2-thionate) have been prepared and characterised by solution and solid-state NMR spectroscopy. A cry stal structure determination of 1 (R = Me) revealed it to be a monomer ic six-co-ordinate, distorted-octahedral complex with chelating MeO(2) CCH(2)CH(2) groups and trans-carbon atoms [Sn-O(C) 2.629(7) Angstrom]. The MeO(2)CCH(2)CH(2) group in 2, both in solution and in the crystal , is monodentate: the tin centres in the anions of both complexes 2 we re shown to have structures closer to rectangular pyramids than to tri gonal bipyramids. There were, however, slight differences in the solid -state structures of the anions, particularly in regard to the separat ions of the Sn and carbonyl oxygen atoms; Sn ... O intramolecular dist ances are 4.84(1) and 3.371(4) Angstrom in 2 (Q = NEt(4)) and 2 (Q = 1 ,4-dimethylpyridinium) respectively. There were also differences in th e packing of the anions.