期刊
DALTON TRANSACTIONS
卷 46, 期 44, 页码 15589-15598出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt03509h
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资金
- Department of Science and Technology (DST, SERB)
- Council of Scientific and Industrial Research, New Delhi (India)
- Land Baden-Wurttemberg (Germany)
The redox-active ligand 5,7,12,14-tetraazapentacene-6,13-quinone = L forms structurally characterised compounds with three (1) or four (2) [Ru(acac)(2)] complex fragments in which each of the metals is N,O-chelated. The new tris- and tetrakis-bidentate chelate compounds exhibit ruthenium centres bridged at about 4 A by quinone O atoms which are then situated across the pentacene pi system at about 6-8 A distance. Several electron transfer processes were observed by voltammetry (CV, DPV) and the intermediates identified by EPR and UV-Vis-NIR spectroelectrochemistry. TD-DFT calculations were applied to assign the proper oxidation states within the multistep redox systems {(mu(n)-L)[Ru(acac)(2)](n)}(k), n = 3 or 4, revealing both metal and ligand based electron transfer.
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