Carbonyl nitrosyl halide complexes of molybdenum and tungsten. III. Bis(diphenylarsino)methane and Bis(diphenylphosphino)methane complexes of tungsten

Abstract

Reaction of the potentially bidentate ligand bis(diphenylarsino)methane (dam) with W(CO)₄(NO)X yields the complexes mer-W(CO)₃(NO)(dam)X and cis-W(CO)₂(NO)(dam)₂X in which the arsine ligand is monodentate, and the novel complex [W(CO)₂(NO)X]₂(dam), which is believed to contain both dam and halide bridges.     However, bis(diphenylphosphino)methane(dpm) forms cis- W(CO)₂(NO)(dpm)X and W(CO)(NO)(dpm)₂X. The latter complex contains both monodentate and bidentate dpm.     Nuclear magnetic resonance spectroscopy and infrared spectroscopy have proved valuable in the elucidation of the structures and properties of these compounds.