摘要 : Tin(iv) and lead(ii) complexes of 3-(trifluoromethyl)pyridine-2-thione (3-CF_3-pySH) and 5-(trifluoromethyl)pyridine-2-thione (5-CF_3-pySH) have been synthesised. The compounds [Sn(3-CF_3-pyS)_4] (1), [Sn(5-CF_3-pyS)_4] (2), (Pb(3... 展开 Tin(iv) and lead(ii) complexes of 3-(trifluoromethyl)pyridine-2-thione (3-CF_3-pySH) and 5-(trifluoromethyl)pyridine-2-thione (5-CF_3-pySH) have been synthesised. The compounds [Sn(3-CF_3-pyS)_4] (1), [Sn(5-CF_3-pyS)_4] (2), (Pb(3-CF_3-pyS)_2] (3), and [Pb(5-CF_3-pyS)_2] (4) were obtained by addition of the appropriate ligand to a methanol solution of tin(ii) chloride or lead acetate in the presence of triethylamine. The complex [Sn(5-CF_3-pyS)_4] was also prepared by electrochemical oxidation of a tin anode in a cell containing an acetonitrile solution of the ligand 5-(trifluoromethyl)pyridine-2-thione. The X-ray crystal structure of [Sn(3-CF_4-pyS)_4] reveals a dodecahedral coordination geometry around Sn~(iv), which the four thionate ligands acting in a bidentate (N,S) manner, [Sn(5-CF_3-pyS)_4] also consists of monomeric neutral molecules with the tin(iv) atom in an octahedral geometry with two bidentate (N,S) ligands and two monodentate S ligands. The molecular structure of [Pb(3-CF_3-pyS)_2] shows the metal in a five-coordinate geometry with the stereochemically active lead(ii) lone pair in an equatorial position of a trigonal bipyramid. Spectroscopic data for the complexes (IR, NMR, FAB, and Mossbauer spectra) are discussed and related to the structural information. 收起