[μ-Bis(diphenylarsino)methane-1:2κ2As:As] nonacarbonyl-1κ3 C,2κ3 C,3κ3 C-(triphenyl phosphite-3κP)-triangulo-triruthenium(0)

Abstract

The asymmetric unit of the title triangulo-triruthenium compound, [Ru 3(C25H22As2)(C18H 15O3P)(CO)9], contains two crystallographically independent but similar molecules. The bis-(diphenyl-arsino)methane ligand bridges an Ru - Ru bond and the monodentate phosphite ligand bonds to the third Ru atom. Both the phosphite and arsine ligands are equatorial with respect to the Ru3 triangle. In addition, each Ru atom carries one equatorial and two axial terminal carbonyl ligands. One of the triphenyl-phosphite benzene rings in one of the molecules is disordered over two positions with refined site occupancies of 0.60 (3) and 0.40 (3). In the crystal packing, the molecules are stacked along a axis. Intra-molecular C - H⋯O hydrogen bonds stabilize the mol-ecular structure and weak inter-molecular C - H⋯π interactions further stabilize the crystal structure. The crystal studied was a non-merohedral twin, the refined ratio of the twin components being 0.618 (1):0.382 (1).