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Type: Artigo de periódico
Title: Synthesis, Spectroscopy, Tandem Mass Spectrometry, And Electrochemistry Of The Linearly Bridged μ-{trans-1,4-bis[2-(4-pyridyl)ethenyl]-benzene}-{ru 3o(ch3coo)6(py)2}2 Cluster
Author: Toma S.H.
Nikolaou S.
Tomazela D.M.
Eberlin M.N.
Toma H.E.
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 1H 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 Ru3-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 BPEB 0/1-/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. © 2004 Published by Elsevier B.V.
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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