Trinuclear Ruthenium Complex with a Face-Capping Benzene Ligand. Hapticity Change Induced by Two-Electron Redox Reaction

Activation of Organic Substrates on Multi-Metallic Sites of Transition Metal Polyhydride Clusters Having C5Me5 Groups as Auxiliary Ligands

“…of 1,3-cyclohexadiene in tetrahydrofuran resulted in the quantitative formation of a face-capping benzene complex {(C 5 Me 5 )Ru) 3 (µ-H) 3 (µ 3 -η 2 :η 2 :η 2 -C 6 H 6 ) (36) by CϪH bond cleavage at the allylic carbon atoms [Equation (19)]. [38] ( 19) The shift of the 1 H and 13 C NMR resonances for the coordinated benzene ligand, respectively, are much higher than those observed in the carbonyl clusters Ru 3 (CO) 9 (µ 3 -η 2 :η 2 :η 2 -C 6 H 6 ) [39] and Os 3 (CO) 9 (µ 3 -η 2 :η 2 :η 2 -C 6 H 6 ). [40] The µ 3 -η 2 :η 2 :η 2 coordination of the benzene ring was unequivocally confirmed by an X-ray diffraction study.…”

Construction of a Planar Tetrapalladium Cluster by the Reaction of Palladium(0) Bis(isocyanide) with Cyclic Tetrasilane

“…In many cases, the clusters are also used as structural models of the active sites in heterogeneous catalysts. Detailed spectroscopic analysis of the substrates coordinated to the cluster framework has provided unique insight into the function of the active surface in, for example, the chemisorption process [4,5]. Moreover, some of the clusters provide structural and/or functional mimics of the active sites in enzymes [6][7][8][9].…”

Searching for molecular arene hydrogenation catalysis in ionic liquids

“…Following a search of potential clusters with (or with the capacity to bind) a face-capping arene ligand the trinuclear ruthenium clusters described by Suzuki and coworkers [29] appeared to be the ideal candidates for evaluation (see Scheme 2). The well characterized arene hydrogenation cluster catalysts [H 4 Ru 4 (g 6 -arene) 4 ] 2+ , which operate in water [30], and also ionic liquid [31], were not selected for this study as face-capping coordination is unlikely to occur.…”