Issue 10, 2008
From the journal:

Photochemical & Photobiological Sciences

Solvent effects on excitation relaxation dynamics of a keto-carotenoid, siphonaxanthin†

Seiji Akimoto,*a   Makio Yokono,b   Michiya Higuchi,c   Tatsuya Tomo,d   Shinichi Takaichi,e   Akio Murakamif  and  Mamoru Mimurocd  

* Corresponding authors

a Molecular Photoscience Research Center, Kobe University, Kobe, Japan
E-mail: akimoto@hawk.kobe-u.ac.jp
Fax: +81-78-803-5705
Tel: +81-78-803-5705

b The Institute of Low-Temperature Science, Hokkaido University, Japan

c Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan

d Department of Technology and Ecology, Hall of Global Environmental Research, Kyoto University, Kyoto, Japan

e Department of Biology, Nippon Medical School, Kawasaki, Japan

f Kobe University Research Center for Island Seas, Awaji, Japan

Abstract

Solvent effects on relaxation dynamics of a keto-carotenoid, siphonaxanthin, were investigated by means of the femtosecond time-resolved fluorescence spectroscopy. After excitation to the S2 state of siphonaxanthin, the S2 → 1(n, π*) internal conversion occurred with a time constant of 30–35 fs, followed by the 1(n, π*) → S1 internal conversion in 180–200 fs. Solvent dependence of the internal conversions was small, however intensities of the S1 fluorescence with its lifetime of longer than 10 ps were enhanced in methanol. These were explained by displacement of the potential surfaces and interaction through the hydrogen-bond between the C[double bond, length as m-dash]O group of siphonaxanthin and solvents.

Graphical abstract: Solvent effects on excitation relaxation dynamics of a keto-carotenoid, siphonaxanthin

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Article information

DOI
https://doi.org/10.1039/B802658K
Article type
Paper
Submitted
15 Feb 2008
Accepted
21 Jul 2008
First published
06 Aug 2008

Photochem. Photobiol. Sci., 2008,7, 1206-1209

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Solvent effects on excitation relaxation dynamics of a keto-carotenoid, siphonaxanthin

S. Akimoto, M. Yokono, M. Higuchi, T. Tomo, S. Takaichi, A. Murakami and M. Mimuro, Photochem. Photobiol. Sci., 2008, 7, 1206 DOI: 10.1039/B802658K

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