Organotransition-metal complexes of multidentate ligands XV. Chelate-assisted synthesis of molybdenum(II) carbonyl complexes; crystal structure of 2-dppm)(η1-dppm)(CO)2Br2> (dppm = bis(diphenylphosphino)methane)

Article abstract of DOI:10.1016/0022-328X(91)86099-C

The bis(3,5-dimethylpyrazol-1-yl)methane (H2CPz'2) of the air-stable compounds, and 3-allyl)Br>, is easily removed in the course of reaction with phosphorus donors whose core angles are less than or equal to 125 deg to give, respectively, (L = PMe3 or P(OMe)3, n = 3: L = dppm or dppe, n = 2) and 3-allyl)Br> (L = PMe3 or P(OMe)3, n = 2: L = dppm or dppe, n = 1).This demonstrates that a variety of molybdenum(II) carbonyl complexes can be obtained readily from through the chelate assistance of the nitrogen bidentate ligand, H2CPz'2, where dppm is bis(diphenylphosphino)methane and dppe is 1,2-bis(diphenylphosphino)ethane.The structure of has been determined by X-ray crystallography supporting the conclusion that both and include one bidentate and one unidentate dppm of dppe ligands respectively, space group P<*>1, a = 12.999(4), b = 13.917(4), c = 14.592(5) Angstroem, α = 78.85(3), β = 71.63(3), γ = 73.02(3) deg, V = 2381.1(13) Angstroem, Z = 2, D_calc = 1.507 g/cm³, R = 0.032 and R_w = 0.031 on 5542 reflections with I > 3.0?(I).