155380-64-6Relevant academic research and scientific papers
Assembly of tetranuclear ruthenium complexes with planar metal core by condensation of two diruthenium units using bridging ligands: Synthesis and molecular structure of [Ru4(CO)8{μ2-P(Cy)2}4] and [Ru4(CO)8{μ4-P(Cy)}2{μ2-P(Cy)2}2] (Cy = cyclohexyl)
Beguin,Rheinwald,Stoeckli-Evans,Suss-Fink
, p. 525 - 532 (1994)
The dinuclear complexes [Ru2(CO)6{μ-P(Cy)2}2] (1) or [Ru2(CO)4{μ-(HCO2)}2{P(Cy)2H}2] (2) react in THF solution at 160° to give the tetranuclear complexes [Ru4(CO)8{μ2-P(Cy)2}4] (3) and [Ru4(CO)8{μ4-P(Cy)}2{μ2-P(Cy)2}2] (4), as well as the trinuclear complex [Ru3(CO)7(μ3-H){μ2-P(Cy)2}3] (5). If the reaction is performed at 200°, the bicapped tetranuclear species 4 is obtained in a higher yield, whereas 3 and 5 are formed in trace amounts only. The phenylderivatives [Ru2(CO)6{μ-P(Ph)2}2] (6) or [Ru2(CO)4{μ-(EtCO2)}2{P(Ph)2H}2] (7) react in a similar manner to give only the complex [Ru4(CO)8{μ4-P(Ph)}2{μ2-P(Ph)2}2] (8), analogous to 4. The molecular structure of 3 consists of a planar framework of four Ru-atoms, each Ru-Ru bond being bridged by a μ2-dicyclohexylphosphino ligand. The complex 4 represents a planar rectangular Ru core, both faces being capped by μ4-cyclohexylphosphinidene ligands and two opposite edges being bridged by μ2-dicyclohexylphosphino ligands.
