Issue 8, 2008

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

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

Article information

Article type
Paper
Submitted
15 Apr 2008
Accepted
20 Jun 2008
First published
09 Jul 2008

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

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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