Binuclear cadmium dithiophosphate crystals:: 13C, 31P, and 113Cd CP/MAS NMR studies

Binuclear diisopropyl and dicyclohexyl dithiophosphate cadmium complexes, namely, [Cd-2{S2P(OR)(2)}(4)], were studied by high-resolution heteronuclear (C-13, P-31, and Cd-113) NMR spectroscopy in the solid state in a temperature range from 295 to 378 K. P-31 NMR signals for the terminal and bridging ligands of the complexes were differentiated. The experimental NMR spectra show P-31-Cd-111,Cd-113 and (CdP)-Cd-113-P-31 spin-spin couplings only for the terminal ligands. The chemical shift aniosotropy delta(aniso) and the asymmetry parameter eta were calculated for P-31 and Cd-113 NMR signals. It was found that the P-31 chemical shifts for the terminal and bridging dithiophosphato groups differ in anisotropy character.