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Journal of Coordination Chemistry Volume 58, 2005 - Issue 14
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Original Articles

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
Pages 1241-1248 | Received 01 Jul 2004, Accepted 08 Apr 2005, Published online: 25 Jan 2007
 
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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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