[μ-Bis(diphenylphosphanyl)methane-1:2κ2P:P′]nonacarbonyl-1κ3C,2κ3C,3κ3C-[tris(biphenyl-4-yl)arsane-3κAs]-triangulo-triruthenium(0)

In the title triangulo-triruthenium compound, [Ru-3(C36H27As)(C25H22P2)(CO)(9)], the bis(diphenylphosphanyl)methane ligand bridges an Ru-Ru bond and the monodentate arsine ligand bonds to the third Ru atom. Both the arsine and phosphine ligands are equatorial with respect to the Ru-3 triangle. In addition, each Ru atom carries one equatorial and two axial terminal carbonyl ligands. In each biphenyl unit, the phenyl rings are twisted from each other, making dihedral angles of 51.22 (18), 42.94 (16) and 26.95 (16)degrees. The arsine-substituted phenyl rings make dihedral angles of 61.22 (15), 87.17 (15) and 83.32 (15)degrees with each other. The dihedral angles between the two benzene rings are 85.52 (18) and 81.77 (15)degrees for the two diphenylphosphanyl groups, respectively. In the crystal, molecules are linked into dimers by intermolecular C-H center dot center dot center dot O hydrogen bonds. Weak intermolecular C-H center dot center dot center dot pi and pi-pi [centroid-centroid distance = 3.6981 (18) angstrom] interactions stabilize the crystal structure.