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Synthesis, electrochemistry and photo-induced electron transfer of unsymmetrical dinuclear ruthenium osmium 2,2′-bipyridine complexes

Paper ID Volume ID Publish Year Pages File Format Full-Text
27018 43994 2014 9 PDF Available
Title
Synthesis, electrochemistry and photo-induced electron transfer of unsymmetrical dinuclear ruthenium osmium 2,2′-bipyridine complexes
Abstract

•Unsymmetrical heteronuclear Os–Ru complexes were synthesized.•Supramolecular system of heteronuclear Os(bpy)3-viologen-Ru(bpy)3⊂CB[7] has been studied.•CB[7] preferred to bind on butyl chain of Os side in acetonitrile solution.•Photo-induced electron transfer of unsymmetrical dinuclear complexes was studied by UV-vis spectrophotometer.

Four unsymmetric dinuclear ruthenium and osmium complexes, Os(bpy)3-viologen-Ru(bpy)3 (1; bpy = 2,2′-bipyridyl), Ru(bpy)3-viologen-Ru(bpy)(dcbpy)2 (2; dcbpy = 4,4′-dicarboxyl-2,2-bipyridyl), Os(bpy)3-viologen-Ru(bpy)(dcbpy)2 (3) and rotaxane 1⊂CB[7] (CB[7] = cucurbit[7]uril), were successfully synthesized. The NMR, electrochemistry and photochemistry studies of these complexes were performed in non-aqueous solutions. The results show that the CB[7] host mainly locates at the butyl linker part of the osmium side in an acetonitrile solution. This binding lowers the oxidation potential of osmium whereas the oxidation potential of ruthenium does not change. The oxidation potential of ruthenium in complexes 2 and 3 is higher due to the electron withdrawing property of carboxylic anchor groups. Analysis with UV–vis spectra shows the viologen radical formation and reversed process of these complexes in non-aqueous solutions.

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Keywords
Ruthenium bipyridine; Osmium bipyridine; Viologen; Cucurbit[7]uril; Photo-induced electron transfer
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Synthesis, electrochemistry and photo-induced electron transfer of unsymmetrical dinuclear ruthenium osmium 2,2′-bipyridine complexes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 287, 1 August 2014, Pages 40–48
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us