Crystal and molecular structure of octacarbonyl-µ-[1,2-bis(dimethylarsino)-3,3,4,4,-tetrafluorocyclobutene]-dimanganese (Mn–Mn)

Abstract

Crystals of the title compound are orthorhombic, space group Pna2₁, with Z= 4 in a unit cell of dimensions: a= 17·479(3), b= 10·273(3), and c= 12·713(3)Å, with one molecule in the asymmetric unit. The structure was determined from three-dimensional X-ray data collected by counter methods and refined by full-matrix least-squares techniques to R 3·5% for 1439 observed reflexions. Each manganese atom is bonded to an arsenic atom, four carbonyl groups, and a manganese atom [Mn–Mn 2·971 (2), mean Mn–As 2·404(3)Å]. The molecule is twisted about the Mn–Mn bond such that the co-ordinated groups normal to the bond vector are staggered.