Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/93767
Type: Artigo de periódico
Title: X-ray Molecular Structures And Multinuclear Nmr Studies Of The Tetranuclear Iridium Clusters [ir4(co)7(μ4- η3-phcc(h)ccph)(μ-pph2)3] And [ir 4(co)7(μ3-η2-hccph) (η1-ccph)(μ-pph2)3]
Author: Araujo M.H.
Pereira R.M.S.
Vargas M.D.
Braga D.
Grepioni F.
Abstract: The reaction of [HIr4(CO)10(μ-PPh2)] with two equiv. of Ph2PCCPh produced [HIr4(CO) 8(Ph2PCCPh)2(μ-PPh2)] (1) in quantitative yield. Mild thermolysis of 1 gave [Ir4(CO) 7(μ4-η3-PhCC(H)CCPh)(μ-PPh 2)3] (2) and [Ir4(CO) 7(μ3-η2-HCCPh)(η1-CCPh) (μ-PPh2)3] (3) in good yields. These compounds were characterized with analytical and spectroscopic data including 1H, 13C and 31P NMR (1 and 2D) spectroscopy, and their molecular structures were established by X-ray diffraction studies. The metal frameworks of 2 and 3 are similarly constituted of a spiked metal triangle; in both clusters the seven CO ligands are terminally bound and the three -PPh 2 ligands span two consecutive Ir-Ir bonds and an open edge. The difference between the two structures is that compound 2 contains a butadienic chain, μ4-η3-PhCC(H)CCPh, interacting with all four iridium atoms, whereas compound 3 bears two fragments of this ligand, i.e. a phenylacetylene capping a triangular face and a terminally bound phenylacetylide bonded to the fourth atom of the cluster. Although these two fragments are directed in the appropriate fashion to interact further and generate the chain of compound 2, they do not undergo condensation under thermolytic conditions. © 2005 Elsevier B.V. All rights reserved.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.jorganchem.2005.07.032
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-26444526611&partnerID=40&md5=f6f3880bb55e20ea773ce01cee665553
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
2-s2.0-26444526611.pdf264.35 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.