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Type: Artigo de periódico
Title: Oxidative Addition Reactions Of I2 With [hir4(co)10-n(pph3)n(μ-pph 2)] (n = 1 And 2) And Crystal And Molecular Structure Of [hir4(μ-i)2(co)7(pph3)(μ- Pph2)]
Author: Braga D.
Grepioni F.
Vargas M.D.
Ziglio C.M.
Abstract: The reactions of the cluster compounds [HIr4(CO)10-n(PPh3)n(μ-PPh 2)] [n = 0, (1); 1, (2) and 2, (3)] with I2 have been investigated. Compound 1 does not react, however, the presence of PPh3 in place of CO ligand(s) activates the cluster. Both compounds 2 and 3 react with I2 under mild conditions to give [HIr4(μ-I)2(CO)7(PPh3)(μ- PPh2)] (4), as the result of oxidative addition of I2 and dissociation of two CO ligands, or one CO and one PPh3 ligands, respectively. The molecular structure of 4, determined by an X-ray diffraction study, exhibits a butterfly arrangement of iridium atoms with the wings spanned by a μ-PPh2 ligand, the hinge bridged by a μ-H ligand, two hinge to wing tip edges bridged by iodine atoms and all metal atoms bearing two CO ligands, with the exception of one of the hinge atoms that contains a CO and a PPh3 ligands. This cluster exhibits the shortest average Ir-Ir bond length [2.698(2) Å] observed so far for a derivative of 1 and this is in accord with the relatively high average oxidation state of its metal atoms (+1) for a carbonyl cluster compound.
Rights: aberto
Identifier DOI: 
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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