Synthesis and Structural Characterization of Ruthenium Carbonyl Cluster Complexes Containing Platinum with a Bulky N‑Heterocyclic Carbene Ligand

The reaction of Ru3(CO)12 with Pt­(IMes)2 in benzene solvent at room temperature afforded the monoplatinum–triruthenium cluster complex Ru3Pt­(IMes)2(CO)11, 1, in 21% yield and the trigonal bipyramidal cluster complex Ru3Pt2(IMes)2(CO)12, 2, in 26% yield. The reaction of Ru­(CO)5 with Pt­(IMes)2 in benzene solvent at 0 °C yielded two trinuclear cluster complexes, the monoplatinum–diruthenium Ru2Pt­(IMes)­(CO)9, 3, and the monoruthenium–diplatinum cluster complex RuPt2(IMes)2(CO)6, 4. The reaction of 2 with hydrogen at 80 °C afforded the tetrahydrido–tetraruthenium complex Ru4(IMes)­(CO)11(μ-H)4, 5, and the dihydrido–diruthenium–diplatinum complex Ru2Pt2(IMes)2(CO)8(μ-H)2, 6. All six compounds were structurally characterized by single-crystal X-ray diffraction analyses.