Electronic Absorption Spectrum and Reduction Behavior of a Multicomponent, Trinuclear Ru(II) Species Containing 2,3-Bis(2'-pyridyl)pyrazine Bridging Ligands and 2,2'-Biquinoline Peripheral Ligands

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Title:Electronic Absorption Spectrum and Reduction Behavior of a Multicomponent, Trinuclear Ru(II) Species Containing 2,3-Bis(2'-pyridyl)pyrazine Bridging Ligands and 2,2'-Biquinoline Peripheral Ligands
Creators:
Loiseau, Frédérique
Serroni, Scolastica
Campagna, Sebastiano
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 68, 9, pp. 1677-1686
Uncontrolled Keywords:Bipyridines, Redox behavior, Polypyridine ligands, Multinuclear complexes, UV spectroscopy, Voltammetry, Electrochemistry, Reductions, Ruthenium complexes

Abstract

Electronic absorption spectrum and reduction pattern of a trinuclear Ru(II) species containing 2,3-bis(2'-pyridyl)pyrazine bridging ligands and 2,2'-biquinoline peripheral ligands have been studied and compared with other multinuclear metal complexes of the same family of systems. The structural formula of the compound investigated is [RuCl<sub>2</sub>{Ru(biq)<sub>2</sub>(μ-2,3-dpp)}<sub>2</sub>]<sup>4+</sup> (<strong>1</strong>; biq = 2,2'-biquinoline, 2,3-dpp = 2,3-bis(2'-pyridyl)pyrazine). The electronic absorption spectrum of <strong>1</strong> (in acetonitrile) is dominated by intense spin-allowed ligand-centred bands in the UV region and by moderately intense spin-allowed metal-to-ligand charge-transfer bands in the visible. The studied compound undergoes several quasireversible reduction processes in the potential window investigated (up to -1.20 V <i>vs</i> SCE in DMF): two successive one-electron reductions at -0.52 and -0.61 V, followed by two processes involving two closely-spaced one-electron reductions each. Extensive comparison with reduction patterns of closely related species allows to assign each process to specific subunits of the multicomponent array. The effect of the peripheral biq ligands on the electronic interaction between inner subunits is evidenced. <p>

Title:Electronic Absorption Spectrum and Reduction Behavior of a Multicomponent, Trinuclear Ru(II) Species Containing 2,3-Bis(2'-pyridyl)pyrazine Bridging Ligands and 2,2'-Biquinoline Peripheral Ligands
Creators:
Loiseau, Frédérique
Serroni, Scolastica
Campagna, Sebastiano
Uncontrolled Keywords:Bipyridines, Redox behavior, Polypyridine ligands, Multinuclear complexes, UV spectroscopy, Voltammetry, Electrochemistry, Reductions, Ruthenium complexes
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:68
Number:9
Page Range:pp. 1677-1686
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20031677UNSPECIFIED
ID Code:2146
Item Type:Article
Deposited On:06 Feb 2009 17:16
Last Modified:06 Feb 2009 16:16

Citation

Loiseau, Frédérique; Serroni, Scolastica; Campagna, Sebastiano (2003) Electronic Absorption Spectrum and Reduction Behavior of a Multicomponent, Trinuclear Ru(II) Species Containing 2,3-Bis(2'-pyridyl)pyrazine Bridging Ligands and 2,2'-Biquinoline Peripheral Ligands. Collection of Czechoslovak Chemical Communications, 68 (9). pp. 1677-1686. ISSN 0010-0765

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