Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/78910
Type: Artigo de periódico
Title: Synthesis, spectroscopy, tandem mass spectrometry, and electrochemistry of the linearly bridged mu-{trans-1,4-bis[2(4-pyridyl)ethenyl]-benzene}-{Ru3O(CH3COO)(6)(py)(2)}(2) cluster
Author: Toma, SH
Nikolaou, S
Tomazela, DM
Eberlin, MN
Toma, HE
Abstract: The novel polynuclear [{Ru3O(CH3COO)(6)(py)(2)}(2)(BPEB)](PF6)(2) species containing the linear bridging trans-1,4-bis[2-(4-pyridyl)ethenyl]-benzene ligand (BPEB) was synthesized and its structural characterization carried out by means of positive ion electrospray (ESI-MS) and tandem mass (ESI-MS/MS) spectrometry, as well as by H-1 NMR spectroscopy. The doubly charged cation [{Ru3O(CH3COO)(6)(py)(2))(2)(BPEB)](2+) was detected in the ESI-MS mass spectrum as a multiple-component isotopomeric ionic cluster centered at m/z 974, which ion abundance and m/z distribution matched perfectly the isotopic pattern calculated for this multiple isotope Ru-3-containing ion. The tandem mass spectrum of [ Ru3O(CH3COO)(6)(py)(2)}(2)(BPEB)](2+) provided a structural diagnostic dissociation behavior, on the basis of the characteristic charge splitting and sequential ligand loss steps. The cyclic voltammograms of the complex exhibited a quasi-reversible multistep redox behavior, displaying three waves at 1.14, 0.08, and -1.21 V ascribed to the [Ru3O](2+/1+/0/1-) processes and two waves at -1.56 and -1.78 V ascribed to the BPEBO0/1-/2- redox processes which are also observed in the free ligand, at -1.48 and 1.61 V, respectively. In spite of the conducting nature of the bridging ligand, the electrochemical and spectroelectrochemical results indicated a weak electronic coupling between the triangular cluster centers. (C) 2004 Published by Elsevier B.V.
Subject: triruthenium clusters
conjugated bridging ligand
tandem mass spectrometry
nuclear magnetic resonance
cyclic voltammetry
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/j.ica.2003.11.050
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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