ON THE MOLECULAR-STRUCTURE OF GOLD(I) COMPLEXES WITH HETEROCYCLIC THIONES - THE STRUCTURE OF BIS(1,3-THIAZOLIDINE-2-THIONE) GOLD(I) CHLORIDE HYDRATE

The preparation of a series of gold(I) coordination compounds with heterocyclic thiones is reported. The crystal structure of the coordination compound with 1,3-thiazolidine-2-thione (tztH) was determined. The S-Au-S angle is 176.4(2)degrees and the two Au-S distances are 2.281(5) and 2.288(5) angstrom, respectively, giving rise to the usual linear gold(I) environment. Extended Huckel computations on both the model and the observed Au(thione)2 cationic unit are used in an attempt to unravel the factors influencing the local and overall molecular structure observed, which is determined by an extended hydrogen-bond network. On the grounds of these computations and the existing structural evidence, it is concluded that hydrogen bonds formed by the coordinated thione ligands determine the geometry adopted by these and analogous compounds.