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

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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.

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