Crystal and molecular structure of [bis(diphenylarsino)methane]dibromodicarbonylmolybdenum(II)

Abstract

Crystals of the title compound are monoclinic, space-group P2₁/c, Z= 4, cell dimensions: a= 11·543(10), b= 22·121(17), c= 19·464(15)Å, and β= 94·31 (11)°. The structure was solved by Patterson and Fourier methods from diffractometer data and refined by a blocked full-matrix technique to P 0·085 for 2018 independent reflections. One of the arsine ligands is bi- and the other uni-dentate, so that the molybdenum atom is seven-coordinate. The environment of the metal atom is best described as distorted capped octahedral with a carbonyl group in the unique capping position [Mo–C 1·92(4)Å]. The capped face of the octahedron contains the other carbonyl group [Mo–C 1·90(4)Å] and two arsenic atoms from different arsine ligands [2·608(5) and 2·592(5)Å]. The uncapped face contains two bromine atoms [2·650(5) and 2·674(5)Å] and one arsenic atom [2·651(5)Å].