Nuclear magnetic resonance studies on metal complexes. Part III. Dimethylphenylphosphine complexes of ruthenium(II)

Abstract

New complexes are described of types [RuX₂(CO)(PMe₂Ph)₃](X = Cl, Br, I, or SCN), [RuXCl(CO)(PMe₂Ph)₃](X = Br, or I, [RuHX(CO)(PMe₂Ph)₃](X = Cl, Br, or I), and [RuX₂(CO)₂(PMe₂Ph)₂](X = Cl, Br, or I). Results for the methyl resonance spectra are given, the spectra being very useful in determining stereochemistry. Empirical shielding constants are calculated for the effects on the τ-values of the methyl resonances on replacing Cl by Br or I. Resonance results for the ruthenium hydrides are reported as are infrared and dipole moment measurements. The trans-effects of carbon monoxide, tertiary phosphine, and chloride ligands in ruthenium(II) complexes are discussed.