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|Type:||Artigo de periódico|
|Title:||The Synthesis And Reactivity Of The Heptanuclear Dianion [os7(co)20]2- Including The Synthesis And Structural Characterizations Of The Compounds [os7(co)20(aupet)32] And [os8(co)20(η6-c6h6]|
|Abstract:||Reduction of the heptaosmium cluster [Os7(CO)21] With [Et4N][NH4) gives the cluster dianion [Os7(CO)20]2-, 1, in high yield. The reaction of the dianion with [AuP R3Cl] (R=Et or Ph) in the presence of TlPF6 forms [Os7((CO)20(AuP R3)2] [R=Et (2a);R = Ph(2b)] in 80% yield, while the corresponding reaction with (Os(C6H6)(CH3CN)3]2+ gives [Os8(CO)20 (η6-C6H6)] (3) in reasonable yield (ca. 30%). The dianion, 1, and the clusters 2 and 3 have been fully characterized by bout spectroscopic and crystallographic methods. The crystal structure of the [Ph4P]+ salt of 1 shows that the metals in the anion adopt a capped octahedral geometry, with all twenty carbonyl ligands in terminal sites. The metal core geometry in 2a is best described as a tricapped octahedron, and is based on the structure of the dianion 1 with two adjacent octahedral faces capped by the Au atoms of the two AuPEt3 groups. In a similar fashion, the geometry of 3 is related to that of 1 with the addition of an Os(C6H6) unit capped to a triangular face, to give a bicapped octahedral framework. © 1995 Plenum Publishing Corporation.|
|Editor:||Kluwer Academic Publishers-Plenum Publishers|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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