Induced crystallization of polymeric Cd(II)-DMPYS assemblies (DMPYS=4,6-dimethyl-pyrimidine-2-thiolato):synthesis and chaining structures of alpha-and beta-[Cd(DMPYS)_2]_n

摘要

The reaction product of cadmium acetate dihydrate with 4,6-dimethyl-2-pyrimidinethiol (DMPYSH) in ethanol solubilizes by stirring with DMSO {(CH_3)_2SO} or ammonium diethyl dithiophosphate affording the title commounds alpha-(1) and beta-[Cd(DMPYS)_2]_n (2).The slow evaporation of the ethanolic solutions allows the suitable crystallization of both polymers and their X-ray diffraction analysis.The complexe 1 and 2 crystallize in the space groups P2_1/c and Pca2_1,assembling polymeric,single chains along the crystallograpohic axis a (1) and b (2).The cadmium centers achieve a distorted octahedral coordination in the whole lattice with the support of four (in 1) and three (in 2) DMPYS molecules.Although in both compounds the anionic ligand DMPYS~- realizes mu-S and chelating S,N(ring) bonds,in 2 the bridging S-bonds are singly strengthened by two bidentate bridging bonds of the pyrimidine N-atoms.The polymeric lattice of both compounds is unknown up to date,and probably is matured by the slow splitting of the chelating DMSO and ammonium diethyl dithiophosphate from de Cd coordination sp9here of the primary insoluble complexes.