The effective electron-transfer distance in dinuclear ruthenium complexes containing the unsymmetrical bridging ligand 3,5-Bis(2-pyridyl)-1,2,4-triazolate

Journal Publication ResearchOnline@JCU
D'Alessandro, Deanna M.;Dinolfo, Peter H.;Hupp, Joseph T.;Junk, Peter C.;Keene, F. Richard
Peter Junk
Abstract

Electroabsorption (Stark effect) measurements on the intervalence charge-transfer (IVCT) transitions in the diastereoisomers of [{Ru(bpy)2}2(-bpt-)]4+ [bpy = 2,2-bipyridine, bpt- = 3,5-bis(2-pyridyl)-1,2,4-triazolate] in n-butyronitrile glass at 77 K reveal effective charge-transfer distances of 5.92 ± 0.03 Å for the / form and 5.44 ± 0.04 Å for the / form. These values correspond to approximately 95 and 88 %, respectively, of the geometrical metal-metal distance of 6.185(10) Å, obtained from the X-ray crystal structure of the cation in the related complex ()-[{Ru(Me2bpy)2}2(-bpt-)](PF6)3. The results are consistent with a localized Class II classification for the mixed-valence systems [{Ru(pp)2}2(-bpt-)]4+, where pp = bpy, Me2bpy = 4,4-dimethyl-2,2-bipyridine.

Journal

European Journal of Inorganic Chemistry

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Volume

2006

ISBN/ISSN

1099-0682

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Issue

4

Pages Count

12

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Publisher

Wiley-VCH

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Publisher Location

Berlin, Germany

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Date

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EISSN

N/A

DOI

10.1002/ejic.200500916