Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/52391
Type: Artigo de periódico
Title: High nuclearity iridium clusters derived from the transformation of [Ir-4(CO)(11)(PPh2Cl)] on silica gel and the thermolysis of [HIr4(CO)(10)(mu-PPh2)]; synthesis and characterization of [Ir-6(mu-CO)(CO)(12)(mu-PPh2)(2)], [Ir-7(mu-CO)(CO)(13)(mu-PPh2)(mu(3)-PPhC6H4)] and [Ir-8(mu-CO)(2) (CO)(14)(eta(1)-Ph)(mu-PPh2)(mu(4)-PPh)]
Author: de Araujo, MH
Vargas, MD
Braga, D
Grepioni, F
Abstract: The monosubstituted compound [Ir-4(CO)(11)(PPh2Cl)] reacts on silica gel to give [HIr4(CO)(10)(mu-PPh2)] and the novel compounds [Ir-4(CO)(11)(PPh2OH)] and [Ir-6(mu-CO)(CO)(12)(mu-PPh2)(2)] whose relative yields (up to 75, 10 and 40%, respectively) depend on cluster loading and the polarity of the eluent. The molecular structure of the hexanuclear compound was established by an X-ray analysis and consists of an octahedron of iridium atoms with two diphenylphosphido groups symmetrically bridging two non consecutive edges. Thermolysis of [HIr4(CO)(10)(mu-PPh2)] in THF results in the formation of the same hexanuclear compound (up to 40%), together with [Ir-7(mu-CO)(CO)(13)(mu-PPh2)(mu 3-PPhC6H4)] (10%) and [Ir-s(mu-CO)(2)(CO)(14)(eta(1)-Ph)(mu-PPh2)(mu(4)-PPh)] (40%), depending on the reaction conditions; their molecular structures were determined by X-ray analyses. The heptanuclear compound exhibits a capped octahedral metal frame with a diphenylphosphido and a phenyl orthometallated phosphido ligands bridging two opposite equatorial edges of the octahedron; the octanuclear cluster exhibits a fused octahedron-square based pyramid metal atom arrangement with the phosphinedene ligand bonded to the square face of the pyramid and the phosphido group to one of the edges of the octahedron. Possible mechanisms for the formation of these high nuclearity clusters are discussed. (C) 1998 Elsevier Science Ltd. All rights reserved.
Subject: high nuclearity clusters
iridium
synthesis
thermolysis
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/S0277-5387(98)00031-X
Date Issue: 1998
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
File Description SizeFormat 
WOS000076290300009.pdf476.32 kBAdobe PDFView/Open


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