32660-96-1Relevant academic research and scientific papers
The synthesis of heteronuclear clusters containing cyclopentadienyl- or pentamethylcyclopentadienyliridium and ruthenium or osmium
Srinivasan, Padmamalini,Leong, Weng Kee
, p. 403 - 412 (2007/10/03)
The reaction of Cp*Ir(CO)2 or CpIr(CO)2 with Ru3(CO)12 under a hydrogen atmosphere afforded the heterometallic clusters Cp*IrRu3(μ-H)2(CO) 10 and CpIrRu3(μ-H)2(CO)10, respectively, in moderate yields. In the former reaction, the tetrahydrido cluster Cp*IrRu3(μ-H)4(CO)9 was also formed in trace amounts, although this cluster can be obtained in high yields by the hydrogenation of Cp*IrRu3(μ-H)2(CO) 10; the Cp analogue was not obtainable. The reaction of Os 3(μ-H)2(CO)10 with Cp*Ir(CO) 2 afforded the osmium analogue Cp*IrOs3(μ-H) 2(CO)10 in 70% yield, along with a trace amount of the pentanuclear cluster Cp*IrOs4(μ-H)2(CO) 13. Hydrogenation of Cp*IrOs3(μ-H) 2(CO)10 afforded Cp*IrOs3(μ-H) 4(CO)9 in excellent yield. The reaction of Cp*Ir(CO)2 with Os3(CO)10(CH 3CN)2 afforded the known trinuclear cluster Cp*IrOs2(CO)9 and the novel cluster Cp*IrOs3(CO)11. Solution-state NMR studies show that the hydrides in the iridium-ruthenium clusters are highly fluxional even at low temperatures while those in the iridium-osmium clusters are less so.
Synthesis, structure, and fluxional properties of (η5-C5Me5)(OC)2IrW(CO) 5. A compound with an Ir-W dative bond
Einstein, Frederick W. B.,Pomeroy, Roland K.,Rushman, Paul,Willis, Anthony C.
, p. 250 - 255 (2008/10/08)
The compound (η5-C5Me5)(OC)2IrW(CO) 5 (1) has been synthesized by the reaction of (η5-C5Me5)Ir(CO)2 and W(CO)5(THF) in hexane. The structure of 1 has been solved by conventional crystallographic techniques: space group P1 with a = 9.057 (2) A?, b = 9.560 (3) A?, c = 12.695 (2) A?, α = 71.83 (2)°, β = 83.07 (2)°, γ = 68.62 (2)°, Z = 2; RF = 0.027, RwF = 0.032 for 3426 reflections with I > 3σ(I) having 2θ 5-C5Me5)Ir(CO)2 acts as a donor ligand toward the W(CO)5 fragment via an unbridged Ir-W dative bond of length 3.0539 (11) A?. The 13C NMR spectrum of the compound in CD2Cl2/CH2Cl2 at -97°C was that expected from the solid-state structure. However, on warming the solution all the carbonyl resonances coalesced such that a single broad signal was observed at ambient temperature. A mechanism that involves an intermediate with bridging carbonyls is proposed to account for the carbonyl exchange. The donor-acceptor, metal-metal bond in (η5-C5Me5)(OC)2IrW(CO) 5 was weak since the compound reacted with the donor ligand L (L = CO, PPh3, or Os(CO)4(PMe3)) to yield (η5-C5Me5)Ir(CO)2 and W(CO)5L (in solution at room temperature over a period of ca. 90 min).
UEBERGANGSMETALL-METHYLEN-KOMPLEXE. LII. SYNTHESEKONZEPTE ZUM AUFBAU HETERODINUCLEARER METALL-METALL-MEHRFACHBINDUNGEN
Herrmann, Wolfgang A.,Barnes, Craig E.,Serrano, Ricardo,Koumbouris, Basile
, p. C30 - C34 (2007/10/02)
Novel heterodinuclear metal-metal multiple bonds are accessible by simple high-yield metal-metal coupling reactions: the cobalt-iridium complex (η5-C5H5)Co(μ-CO)2Ir(η5-C5Me5) (Me=CH3; 3) is formed as the main product from the reactio
