Synthesis and spectral studies on N,N,N′,N′-tetramethylethylenediamine adducts of M(II) heterocyclic dithiocarbamates (M=zinc, cadmium): single crystal X-ray structure analysis of bis(1,2,3,4-tetrahydroquinolinecarbodithioato-S,S′)(N,N,N′,N′-tetramethylethylenediamine) cadmium(II)

Abstract

Zn(thqdtc)2(TMEDA) (1), Cd(thqdtc)2(TMEDA) (2), Zn(2-mpipdtc)2(TMEDA) (3), and Cd(2-mpipdtc)2(TMEDA) (4) (where thqdtc=1,2,3,4-tetrahydroquinolinedithiocarbamate, 2-mpipdtc=2-methylpiperidinedithiocarbamate,and TMEDA=N,N,N′,N′-tetramethylethylenediamine) have been synthesized and characterized by infrared (IR) and nuclear magnetic resonance (1H and 13C) spectra. A single crystal X-ray structural analysis was carried out for complex 2. IR spectra of the complexes show the contribution of the thioureide form to the structures. The N13CS2 chemical shifts of Zn(dtc)2(TMEDA) are additionally deshielded compared with Zn(dtc)2 (dtc=thqdtc, 2-mpipdtc) owing to the increase in coordination number. Single crystal X-ray structure analysis of 2 showed that cadmium is in a distorted octahedral environment with a CdS4N2 chromophore. The acceptance of an additional neutral ligand by the tetrahedral dithiocarbamato complex of cadmium to form an octahedral adduct causes an increase in the Cd-S bond lengths.