Reactions and spectroscopic studies of Group 6 metal carbonyls with pyrazinecarboxamide and certain phosphine ligands

Samir M. El-Medani Chemistry Department, Faculty of Science, Cairo University, El-Faiyum Branch, El-Faiyum, EgyptCorrespondence[email protected]

Carmen M. Sharaby Chemistry Department, Faculty of Science, El-Azhar University (Girls), Cairo, Egypt

Ramadan M. Ramadan Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt

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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Reactions and spectroscopic studies of Group 6 metal carbonyls with pyrazinecarboxamide and certain phosphine ligands

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Reactions and spectroscopic studies of Group 6 metal carbonyls with pyrazinecarboxamide and certain phosphine ligands

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