MIXED GROUP 6 METAL CARBONYL COMPLEXES CONTAINING POLYDENTATE PHOSPHINE LIGANDS

摘要

The mixed Group 6 metal carbonyl complexes, [M(CO)(4)(Pf-Pf-Pf)M'(CO)(5)] (M = Cr, M' = Mo, W; M = Mo, M' = Cr, W; Pf-Pf-Pf = PhP(CH(2)CH(2)PPh(2))(2)) and [M(CO)(3)(P-Pf(3))M'(CO)(5)] (M = Mo, M' = W; M = W, M' = Mo; P-Pf(3) = P(CH(2)CH(2)PPh(2))(3)), were prepared from [M(CO)(4)(Pf-Pf-Pf)] and [M'(CO)(5)(CH3CN)] and from [M(CO)(3)(P-Pf(3))] and [M'(CO)(5)(CH3CN)], respectively. Crystals of [Mo(CO)(4)(Pf-Pf-Pf)Cr(CO)(5)] (Ic) are monoclinic, space group P2(1)/c, with a=16.220(3), b = 14.539(3), c = 17.992(7) Angstrom, beta= 95.91(2)degrees, Z = 4, and R = 0.034 for 3954 observed reflections. Crystals of [W(CO)(3)(P-Pf(3))Mo(CO)(5)] (IIb) are triclinic, space group P (1) over bar, with a = 8.826(3), b = 9.974(3), c = 28.418(6) Angstrom, alpha = 84.55(2), beta = 81.24(4), gamma = 80.45(6)degrees, Z = 2, and R = 0.027 for 5559 observed reflections. Each complex contains two different VIB metals and the coordination around each metal is a distorted octahedron. [References: 24]