Crystal and molecular structure of dibromotricarbonyl[1,2-bis(diphenylphosphino)ethane]molybdenum(II)–1-acetone

Abstract

Crystals of the title compound are monoclinic, space-group P2₁/c, with a= 10·330(11), b= 14·526(13), c= 22·120(16)Å, β= 99·76(13)°, Z= 4. The intensities of 1833 independent reflections above background were collected by counter methods and the structure has been refined by full-matrix least-squares methods to R 0·064. The molybdenum atom is seven-co-ordinate with a slightly distorted capped octahedral environment. A carbonyl group occupies the unique capping position [Mo–C 1·895(19)Å]. The capped face of the octahedron contains the other two carbonyl groups [Mo–C 1·958(20) and 1·935(22)Å] and a phosphorus from the bidentate ligand [Mo–P 2·500(4)Å]. The uncapped face contains two bromine atoms [2·658(2) and 2·665(3)Å] and the other phosphorus atom [2·618(5)Å], this bond Mo–P (trans to CO), being significantly longer (by 0·12 Å) than Mo–P (trans to Br).