الفهرس 
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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.
Reflux of 4-(2-thiazolylazo) resorcinol with Cr(C0)6 m dioxane solvent yielded a dinuclear complex with a molecular formula Cr2 02(TAR)2 . The spectroscopic studies and elemental analysis of the complex, showed that each chromium atom existed in octahedral environment and bonded to two bridged oxygen atoms as well as a TAR ligand acting as a tridentate. On the other hand, heating a mixture of TAR with Cr(C0)6 in acetone solvent resulted in the formation of the tris derivatives Cr(TAR)J. The spectroscopic studies of the complex showed that chromium atom bonded oxidatively to three TAR molecule.