Crystal structure of bis(NN-di-isopropyldithiocarbamato)nickel(II)

Abstract

The crystal structure of the title compound has been established by single-crystal X-ray diffraction methods. Crystals are monoclinic, space group P2₁/a, a= 15·62 ± 0·03, b= 17·83 ± 0·03, c= 8·16 ± 0·01 Å, β= 110·5(2)°, Z= 4. The structure was solved by Patterson and Fourier methods and refined by block-diagonal least-squares to R 0·11 for 1909 visually estimated reflections. The structure consists of two independent sets of planar molecules, the nickel atoms each being planar co-ordinated by four sulphur atoms at equal distances (mean Ni–S, 2·181 ± 0·005 Å) and significantly shorter than in previously reported nickel(II) dithiocarbamate structures (mean Ni–S > 2·20 Å), the trend in bond length paralleling crystal-field effects. The remainder of the ligand dimensions are normal [C–S, 1·70(1)Å, S–Ni–S, 79·2(5)°, C–N, 1·33(1)Å]. Steric interaction between the terminal i-propyl substituents leads to an intersting non-equivalence of these within each ligand.