Abstract
The mixed-ligand complexes [NEt4][Zn(S2CNMe2)2X](X = Cl, Br, or NCS) and [NR4][Cd(S2CNEt2)2X](R = Et, X = Cl, Br, or NCS; R = Bun, X = I) have been prepared by reaction of zinc and cadmium bis(dithiocarbamate) with the tetraalkylammonium salt of the halide or thiocyanate in acetone at room temperature. The single-crystal X-ray structures of [NEt4][Zn(S2CNMe2)2(NCS)]1 and [NEt4][Cd(S2CNEt2)2(NCS)]2 were determined: 1, monoclinic, space group P21/n, a= 9.447(1), b= 16.661(2), c= 15.807(1)A, β= 97.10(1)° and Z=4; 2, orthorhombic, space group P212121, a= 16.213(1), b= 17.501(2), c= 10.243(1)A and Z= 4. The central Zn and Cd atoms show distorted trigonal-bipyramidal co-ordination geometry with the thiocyanate N atom occupying an equatorial position and the dithiocarbamate ligands spanning one axial and one equatorial position each. The infrared and Raman spectra (2100–50 cm–1) of the complexes are discussed. The metal–sulfur stretching frequencies are assigned in the ranges 226–205 (Zn–S) and 203–145 cm–1(Cd–S), respectively.
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