Issue 6, 2012
From the journal:

Photochemical & Photobiological Sciences

Bis-semiquinone (bi-radical) formation by photoinduced proton coupled electron transfer in covalently linked catechol–quinone systems: Aviram's hemiquinones revisited†‡

Nguyên Vân Anha  and  René M. Williams*a  

* Corresponding authors

a Molecular Photonics Group, van't Hoff Institute for Molecular Sciences (HIMS), Faculty of Science, Universiteit van Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
E-mail: R.M.williams@uva.nl
Fax: +31 (0)20 525 6456
Tel: +31 (0)20 525 5477

Abstract

The structure and reactivity of a covalently linked catechol-ortho-benzoquinone (hemiquinone) is studied by UV-Vis and IR absorption spectroscopy. Nanosecond transient absorption spectroscopy of the hemiquinone reveals the formation of bi-radical state consisting of two semiquinone units. It is a long-lived state resulting from proton coupled electron transfer (PCET).

Graphical abstract: Bis-semiquinone (bi-radical) formation by photoinduced proton coupled electron transfer in covalently linked catechol–quinone systems: Aviram's hemiquinones revisited

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Article information

DOI
https://doi.org/10.1039/C2PP05378K
Article type
Paper
Submitted
14 Nov 2011
Accepted
24 Dec 2011
First published
23 Jan 2012

Photochem. Photobiol. Sci., 2012,11, 957-961

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Bis-semiquinone (bi-radical) formation by photoinduced proton coupled electron transfer in covalently linked catechol–quinone systems: Aviram's hemiquinones revisited

N. Vân Anh and R. M. Williams, Photochem. Photobiol. Sci., 2012, 11, 957 DOI: 10.1039/C2PP05378K

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