Crystal structures of fac-[bis(2-diphenylphosphinoethyl)phenylphosphine-PP′P″]tricarbonyl-chromium(0) and -molybdenum(0)

Abstract

The crystal structures of the title compounds, [M{Ph₂P(CH₂)₂PPh(CH₂)₂PPh₂}(CO)₃][(1), M = Cr and (2), M = Mo], have been determined by single-crystal X-ray diffraction methods and refined to residuals of 0.055 and 0.071 for 3 653 and 4 345′ observed' reflections respectively. Crystals of (1) are monoclinic, space group P2₁, with a= 20.989(9), b= 17.825(10), c= 8.784(4)Å, β= 99.70(2)°, and Z= 4; those of (2) are monoclinic, space group P2₁/n, with a= 15.181(7), b= 18.799(4), c= 12.053(4), β= 106.62(3)°, and Z= 4. In both (1) and (2), the metal–central phosphorus distance is shorter [(1): 2.334(3), 2.328(4); (2): 2.479(2)Å] than the metal–terminal phosphorus distances [(1): 2.355(4)—2.391(3); (2): 2.504(3), 2.532(3)Å]. In (1) the mean Cr–C length is 1.84 Å; in (2), the mean Mo–C length is 1.97 Å.