Crystal structure of µ-(dimethylarsino)-µ-[3,3,4,4-tetrafluoro-2-(dimethylarsino)cyclobut-1-enyl(As,C)]-bis(tetracarbonylmanganese)

Abstract

Crystals of the title compound (II) are monoclinic, space group P2₁/n with cell dimensions a= 9·040(3), b= 13·552(4), c= l8·517(5)Å°, β= 90·52(2)°Z= 4. The structure was solved from diffractometer data by Patterson and Fourier methods, and refined by full-matrix least-squares techniques to R 3·6% for 1728 observed reflections.

The molecule consists of two Mn(CO)₄ groups bridged by an AsMe₂ group [2·508(2)Å and 2·489(2)Å]. The ligand fragment AsMe₂[graphic omitted]F₂ also bridges the two manganese atoms. One manganese atom is linked to the arsenic atom [2·410(2)Å] while the other is bonded through a σ bond from a carbon atom of the cyclobutene ring.