The crystal and molecular structure of bis(thiocarbohydrazide-N,S)cadmium dichloride

The crystals of bis(thiocarbohydrazideN,S)cadmium dichloride, Cd(SC(NHNH2)2)2Cl2, belong to monoclinic space group P21/c. The structure of the compound, determined from three-dimensional data, consists of trans-octahedral complexes where the ligand molecule forms pentatomic chelate rings with N,S as donor atoms. The chlorine atoms lie along the normal to the plane containing metal and organic molecules. The distances CdN=2.34(3) and CdS=2.59(1) Å are slightly shorter than those found in non-chelate cadmium complexes; CdCl=2.73(1) Å is very close to the sum of ionic radii. The configuration of the ligand, with on -NH2group turned towards SC, repeats that of crystallized thiocarbohydrazide. Some differences, however, in distances, planarity, and angles between complexed or free ligand can be detected. The complexes are held together in layers parallel to (102) by weak hydrogen bonds NH⋯Cl.