Abstract
The preparation and characterisation of novel Re oxo-complexes derived from 2-oxo-1,4-dithiacyclohexane is reported. The direct reaction of [ReO 2py 4][Cl] with a cyclic thioester in water or methanol in presence of base resulted in the synthesis of the carboxylate complex [ReO(HL 1)(L 1)] ( 1) (HL 1 = SCH 2CH 2SCH 2COOH) and methyl ester rhenium complex [ReO(L 1)(L 2)] ( 2) (L 2 = SCH 2CH 2SCH 2COOMe) respectively. The ester complex was also prepared from [ReO 4] −, by using SnCl 2 as a reducing agent in methanolic solution at pH around 8. The complexes were characterised by IR, 1 H , 13 C NMR, FAB MS, crystallographic, and elemental analyses. The X-ray crystal structures of both 1 and 2 were determined by single crystal X-ray diffraction. In both complexes the coordination geometry around Re is pseudo octahedral and the carboxyl oxygen of the uncoordinated carboxylate or ester group is in an anti confirmation with respect to the oxo ligand.
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