Spectral and single crystal X-ray structural studies on disulfide complexes: reaction of bis(dialkyldithiocarbamato) M(II) with iodine and crystal structure determination of diiodo(bipiperidinethiuramdisulfide) M(II) (M = zinc, cadmium)

摘要

Unique diiodo(bipiperidinethiuramdisulfide) zinc(II) (1) and diiodo( bipiperidinethiuramdisulfide) cadmium(II) (2) were prepared by the oxidation of the corresponding bis-dithiocarbamates with iodine and the crystal structures of the compounds are reported. Metal ions are situated at the centre of a tetrahedral arrangement of two sulfur atoms of the piperidine thiuramdisulfide and two iodide ions. Two sets of significantly different C-S distances clearly correspond to single- and double-bonded C-S distances. The disulfide S-S distance in [Zn(bipiptds)I-2] is long compared to the distance in [Cd(bipiptds)I-2]. The two C=S bonds of the disulfide in the present complexes are on the same side, as a requirement for coordination with metal ions. IR spectral studies are in keeping with the thioureide distances. (C) 2000 Elsevier Science Ltd All rights reserved. [References: 15]