THERMOCHEMISTRY OF M(CO)6-XLX (M=CR,MO,W - L=PIPERIDINE, PYRIDINE, PYRAZINE, PYRAZOLE, THIAZOLE - X=1,2,3)

A number of M(CO)6-xLx complexes (M = Cr, Mo, W; L = piperidine, pyridine, pyrazine, pyrazole, thiazole; x = 1, 2, 3) are shown to undergo both disproportionation and substitution in a CO atmosphere, when heated on a thermobalance. Using a DSC, reaction enthalpies have been determined from which enthalpies of formation were calculated. Combined with the sublimation enthalpies of these complexes, individual metal-ligand bond enthalpies were evaluated and discussed. © 1979.