31P{1H}NMR and carbonyl force constants of unsymmetrical bidentate phosphine complexes of group (VI) metal carbonyls

• The labile nature of carbonyl ligands in the metal carbonyls allows us to prepare plethora of complexes.
• Metal carbonyl–phosphine complexes find applications as novel precursor materials for the synthesis of metal phosphides.
• Carbonyl force constants give valuable information on the electronic properties of complexes.
• Metal–ditertiary phosphine complexes recently find applications in tunable optical materials.
• Versatility of ligand substitutions offers many opportunities for developing novel bio-imaging reagents.

In our present work we report synthesis of an unsymmetrical diphos ligand, 1-diphenylphosphino-2-di-m-tolylphosphinoethane and its coordinate complexes with group (VI) metal carbonyls such as Cr(CO)6 Mo(CO)6 and W(CO)6. The synthesized ligand and its complexes have been completely characterized by elemental analyses, FTIR, 1HNMR, 31P{1H}NMR and FAB mass spectrometry methods. Special emphasis has been given to calculations of carbonyl force constants. Based on the spectroscopic evidences it has been confirmed that these metal carbonyl complexes with the ditertiary phosphine ligand showed cis geometry in their molecular structure.

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