Abstract
Substitution reactions of phosphine ligands, triphenylphosphine (PPh3), tri(m-chlorophenyl)phosphine (m-ClPPh3), tri(p-methoxyphenyl)phosphine (p-MeOPPh3) and tri(benzyl)phosphine (PBz3) with [M(CO)4(PCA)] (M = Cr, Mo and W, PCA = pyrazinecarboxamide) were found to be dependent on the type of metal and phosphine ligand. The complexes were characterized by elemental analysis, mass spectrometry, and IR and 1H NMR spectroscopy. UV–vis spectra of the complexes in different solvents showed bands due to metal-to-ligand charge transfer.
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