Bis{[μ-bis-(diphenyl-phosphino)methane-1:2κP:P']nona-carbonyl-1κC,2κC,3κC-[tris-(4-methoxy-phen-yl)arsine-3κAs]-triangulo-triruthenium(0)} dichloro-methane solvate.

The asymmetric unit of the title triangulo-triruthenium compound, 2[Ru(3)(C(21)H(21)AsO(3))(C(25)H(22)P(2))(CO)(9)]·CH(2)Cl(2), contains one triangulo-triruthenium complex mol-ecule and one half-mol-ecule of the dichloro-methane solvent. The dichloro-methane solvent lies across a crystallographic inversion center leading to the mol-ecule being disordered over two positions of equal occupancy. The bis-(diphenyl-phosphino)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. The three arsine-substituted benzene rings make dihedral angles of 82.00 (6), 76.67 (7) and 66.09 (6)° with each other. The dihedral angles between the two benzene rings are 80.12 (8) and 78.34 (7)° for the two diphenyl-phosphino groups. In the crystal packing, the mol-ecules are linked together into chains down the b axis via inter-molecular C-H⋯O hydrogen bonds. An inter-molecular C-H⋯O hydrogen bond and weak inter-molecular C-H⋯π inter-actions further stabilize the crystal structure.