4,6-DIMETHYLPYRIMIDINE-2-THIONATO (DMPYMT-) COMPLEXES OF NICKEL(II) AND CADMIUM(II) - CRYSTAL-STRUCTURE OF [CD(DMPYMT)2] - A COMPOUND WITH A CALIXARENE-LIKE STRUCTURE

Nickel and cadmium complexes of the anionic form of 4,6-dimethylpyrimidine-2-thione (Hdmpymt) and their adducts with neutral ligands (1,10-phenanthroline or 2,2'-bipyridine) have been prepared by an electrochemical procedure and characterized by spectroscopic (IR, UV, H-1 and C-13 NMR) methods, and for the [{Cd(dmpymt)2}6] complex by X-ray crystallographic techniques. This compound is hexanuclear with an array of six cadmium atoms bridged by twelve sulfur atoms. Each cadmium atom has a distorted-octahedral cis-CdS4N2 environment with each ligand acting in a N,S bidentate S-bridging mode. The hexamer has a calixarene-like structure with cavities large enough to accommodate molecules such as acetonitrile, carbon monoxide and molecular iodine.