Crystal structure of a tetrahedral zinc(II) complex of a 1,3-dithiolate: bis(O-ethyl thioacetothioacetato)zinc(II)

Abstract

The crystal and molecular structure of the title compound [Zn(O-Etsacsac)₂] has been determined by X-ray diffraction methods. Crystals are monoclinic, a= 22·769(3), b= 5·2615(3), c= 14·907(3)Å, and β= 106·33(1)° with space group C2/c and Z= 4. The structure was solved by Patterson and Fourier methods and refined by a least-squares method to R 0·054 for 1480 independent reflections, collected on a diffractometer. The crystals are composed of discrete monomeric molecules. Each zinc atom is bonded to two ligand groups, which are related by a two-fold axis, with four sulphur atoms approximately tetrahedrally arranged about the metal atom. The Zn–S bond lengths are ca. 2·30 Å. The bond distances in the chelate ring indicate aromatic character with a lone pair on the ethoxy-oxygen being involved in the delocalization.