Issue 8, 2008
From the journal:

Photochemical & Photobiological Sciences

Photophysical properties of quinones and their interaction with the photosynthetic reaction centre

Arianna Barbafina,a   Fausto Elisei,a   Loredana Latterini,*a   Francesco Milano,b   Angela Agostianobc  and  Massimo Trotta*b  

* Corresponding authors

a Chemistry Department, University of Perugia, via Elce di Sotto 8, Perugia, Italy
E-mail: loredana@unipg.it
Fax: +39 075 5855598
Tel: +39 075 5855636

b CNR – Istituto per i Processi Chimico Fisici, c/o Chemistry Department University of Bari, via Orabona 4, Bari, Italy
E-mail: m.trotta@ba.ipcf.cnr.it
Fax: +39 080 5442128
Tel: +39 080 5442033

c Chemistry Department, University of Bari, Via Orabona 4, Bari, Italy
Fax: +39 080 5442128
Tel: +39 080 5442060

Abstract

Photophysical properties of tetramethyl-1,4-benzoquinone (TMBQ) and 2,6-dimethoxy-1,4-benzoquinone (DMOBQ) in solution and their interactions with the photosynthetic reaction centre (RC) isolated from the photosynthetic bacterium Rhodobacter sphaeroides have been investigated in this work. For these two benzoquinone derivatives an efficient ISC process which leads to the population of the lowest triplet state of the molecules upon direct excitation was observed. The presence of RC does not alter the properties of the triplet state of DMOBQ suggesting that interactions are negligible; on the other side RC efficiently quenched the T1 state of TMBQ. The behavior is rationalized in terms of redox potentials of quinones and kinetic characteristics of their transients.

Graphical abstract: Photophysical properties of quinones and their interaction with the photosynthetic reaction centre

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Article information

DOI
https://doi.org/10.1039/B805897K
Article type
Paper
Submitted
15 Apr 2008
Accepted
20 Jun 2008
First published
09 Jul 2008

Photochem. Photobiol. Sci., 2008,7, 973-978

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Photophysical properties of quinones and their interaction with the photosynthetic reaction centre

A. Barbafina, F. Elisei, L. Latterini, F. Milano, A. Agostiano and M. Trotta, Photochem. Photobiol. Sci., 2008, 7, 973 DOI: 10.1039/B805897K

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