Crystal structures of bis(pyrrolidonecarbodithioato)-nickel(II) and -copper(II)

Abstract

The crystal structures of the title compounds have been established by single-crystal photographic X-ray diffraction methods. Crystals are triclinic, space groupP, a= 7·477(4)[7·491 (2)], b= 7·971 (3)[8·069(2)], c= 6·314(3)[6·379(2)]Å, α= 103·18(5)[104·83(2)], β= 93·47(6)[94·11 (2)], γ= 75·45(5)[76·62(2)}]°, Z= 1. The structures were solved by the heavy-atom method and refined by block-diagonal least squares to R0·10 [0·10] for 857 [953] independent reflections. The structure consists of centrosymmetric molecules, the metal atom being planar co-ordinated by four sulphur atoms at 2·217(2) and 2·201(2)[2·342(2) and 2·345(2)]Å. Intraligand distances are normal. There is no evidence in the copper derivative for dimer formation by intermodular metal-sulphur Interaction.