Carbonyl halides of the Group VI transition metals. XXVI. Nitrosyl halide complexes of molybdenum(II) and tungsten(II) with Bis(diphenyl-phosphino)methane and Bis(diphenylarsino)methane

Abstract

The known polymeric molybdenum nitrosyl halides [Mo(NO)₂X₂ (X = Cl, Br) have been prepared by the action of nitric oxide on Mo(CO)₄X₂. Derivatives of these complexes with bis(diphenylarsino)methane (dam) and its phosphine analogue (dpm) were prepared by direct interaction. In addition, complexes containing dam were formed by the action of nitric oxide on M(CO)₂(dam)₂X₂ (M = Mo, W; X = Cl,Br,I). All compounds isolated were of the form M(NO)₂LX₂ and M(NO)₂L₂X₂ (L = dam or dpm). Differences between the nitrosyl halide derivatives and the corresponding carbonyl halide complexes are interpreted on the basis of a steric argument.