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|Type:||Artigo de periódico|
|Title:||Synthesis And Structural Characterization Of The Phosphido Cluster [ir4h(co)10(μ-pph2)] And Its Facile Carbonyl Substitution Reactions With A Series Of Phosphines And Phosphites|
|Abstract:||The tetranuclear cluster [Ir4H(CO)10(μ-PPh2)] 1 is formed from [Ir4(CO)11(PPh2)] 2 by deprotonation, which yields [Ir4(CO)10(μ-PPh2)]- 3, followed by protonation of the anion. It has been fully characterized by an X-ray analysis, and exhibits a tetrahedral arrangement of metal atoms with the three basal edges bridged by a phosphido, a hydrido and a carbonyl ligand. Both 1 and 3 undergo facile carbonyl substitution reactions with phosphites and phosphines L [PPh3, PPhMe2, P(OPh)3 or P(C6H4X-4)3 (X = F, Cl, Me, 4-Ome or 2-OMe)] to give [Ir4H(CO)9L(μ-PPh2)] 4a-4h and [Ir4(CO)9L(μ-PPh2)]- 5a-5h respectively, the latter being converted into the corresponding hydride derivatives by protonation. Further substitution of a CO in 4a-4h affords [Ir4H(CO)8L2(μ-PPh2)] 6a-6h. An X-Ray analysis of [Ir4H(CO)9(PPh3)(μ-PPh2)] 4a shows that carbonyl substitution has occurred at a basal Ir atom which is not bridged by the phosphido ligand.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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