Synthesis and Spectral Studies on N,N,N′,N′-Tetramethylethylenediamine Adducts of Bis(4-methylpiperidinecarbodithioato-S,S′)M(II) (M = zinc, cadmium): Single Crystal X-Ray Structure of Bis(4-methylpiperidinecarbodithioato-S,S′) (N,N,N′,N′-Tetramethylethylenediamine)zinc(II)

Bis(4-methylpiperidinecarbodithioato- S , S ′)( N , N , N ′, N ′-tetramethylethylenediamine)zinc(II), [Zn(4-mpipdtc) 2 (TMED)] ( 1 ) and bis(4-methylpiperidinecarbodithioato- S , S ′)( N , N , N ′, N ′-tetramethylethylenediamine)cadmium(II), [Cd(4-mpipdtc) 2 (TMED)] ( 2 ) adducts were synthesized and characterized by IR and NMR ( 1 H and 13 C) spectra. A single crystal X-ray structural analysis was carried out for complex 1 . IR spectra of the complexes show the contribution of the thioureide form to the structures. Reduction in ν C–N (thioureide) for the adducts is attributed to the change in coordination number from four to six. In the 13 C NMR spectra, the downfield shift of NCS 2 carbon signal for 2 (205.20 ppm) from the chemical shift value of 1 (202.05 ppm) in due to large size of cadmium ion in 2 experiences less steric effect involved in transformation from tetrahetral to octahedral. Single crystal X-ray structural analysis of 1 showed that zinc is in a distorted octahedral environment with a ZnS 4 N 2 chromophore. The Zn–S distances in 1 are longer than those in parent [Zn(4-mpipdtc) 2 ]. The acceptance of an additional neutral ligand by the [Zn(4-mpipdtc) 2 ] to form an octahedral adduct causes an increase in the Zn–S bond lengths and a consequent lowering of the S–Zn–S bite angle. The piperidine ring in the dithiocarbamate fragment is in the normal chair conformation. Graphical Abstract Bis(4-methylpiperidinecarbodithioato- S , S ′)( N , N , N ′, N ′-tetramethylethylene-diamine)zinc(II) ( 1 ), and bis(4-methylpiperidinecarbodithioato- S , S ′)( N , N , N ′, N ′-tetramethylethylene- diamine)cadmium(II) ( 2 ) were synthesized and characterized by IR and NMR ( 1 H and 13 C) spectra and the structure of 1 was determined by single crystal X-ray crystallography.