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?O group of siphonaxanthin and solvents.
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This paper was published as part of the themed issue of contributions from the 7th International Conference on Tetrapyrrole Photoreceptors in Photosynthetic Organisms held in Kyoto, December 2007.
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Akimoto, S., Yokono, M., Higuchi, M. et al. Solvent effects on excitation relaxation dynamics of a keto-carotenoid, siphonaxanthin. Photochem Photobiol Sci 7, 1206–1209 (2008). https://doi.org/10.1039/b802658k
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DOI: https://doi.org/10.1039/b802658k