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  Electron transfer reactions of extended o-, p-quinones—voltammetric and EPR/ENDOR spectroscopic investigations

Zhou, J., Felderhoff, M., Smelkova (née Timoschkova), N., Gornastaev, L. M., & Rieker, A. (1998). Electron transfer reactions of extended o-, p-quinones—voltammetric and EPR/ENDOR spectroscopic investigations. Journal of the Chemical Society, Perkin Transactions 2, (2), 343-348. doi:10.1039/A705464E.

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Zhou, Jinkui1, Author
Felderhoff, Michael1, 2, Author              
Smelkova (née Timoschkova), Natalja1, 3, Author
Gornastaev, Leonid M.3, Author
Rieker, Anton1, Author
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1Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Chair of Chemistry, Krasnoyarsk State Pedagogical University, Lebedevoy Str. 89, 660049 Krasnoyarsk, Russia, ou_persistent22              

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 Abstract: The electrochemical properties of four ortho-, para-extended quinones/quinonemethides † 1–4 have been investigated using cyclic voltammetry (CV) and normal pulse voltammetry (NPV). The species are reduced by addition of two, four or six electrons to form a dianion (1), tetraanions (2, 3) and a hexaanion (4), all of which can be re-oxidized to the corresponding quinonoid species. These compounds, thus, exhibit a multistep redox behaviour, acting as good (quasi)reversible electron acceptors with well separated potential steps, some of them corresponding to a formal two-electron transfer. The radical anions 1˙–4˙ and the radical trianion 3˙3–, prepared electrochemically in the first and third reduction steps, are persistent for several hours in the absence of air. They have been characterized by EPR and ENDOR spectroscopy, revealing a delocalization of the odd electron. The areas of preferential spin residing, however, are quite different in radical trianion 3˙3– as compared to radical monoanion 3˙, indicating a strong influence of the charge state in these radical anions.

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 Dates: 1998
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/A705464E
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Title: Journal of the Chemical Society, Perkin Transactions 2
Source Genre: Journal
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Publ. Info: London : Royal Society of Chemistry
Pages: - Volume / Issue: (2) Sequence Number: - Start / End Page: 343 - 348 Identifier: ISSN: 1472-7781
CoNE: https://pure.mpg.de/cone/journals/resource/111053443082010_1