COORDINATION CHEMISTRY OF SOME COMPLEXES OF GROUP VI TRANSITION METALS

Abstract

The hexacarbonyls of group VI transition metals are very useful intermediates in synthesis of either organo­ metallic or coordination compounds of chromium, molybdenum and tungsten. There are a vast number of reactions of metal carbonyl complexes. The most important general reactions are those in which CO groups are displaced by other ligands. The vast majority of the ligands used contain nitrogen and /or oxygen and /or sulphur donor atoms. In the present study, two ligands are used; 4-(2- thiazolylazo) resorcinol (TAR) and 1,5- diphenylcarbazone (DPC). Reactions of M(C0)6, M=Cr, Mo and W, with each ligand were carried out in different polar solvents and at atmospheric pressure.