AI Article Synopsis
- * This study investigates fucoxanthin's spectroscopic properties in methanol using femtosecond pump-probe measurements, focusing on absorption and emission behaviors in the near-infrared region.
- * The findings reveal that the intensity of stimulated emission in the S1/ICT state increases with lower excitation energy, indicating that fucoxanthin's structure related to lower energy absorption has a stronger intramolecular charge transfer character.
Article Abstract
Fucoxanthin, containing a carbonyl group in conjugation with its polyene backbone, is a naturally occurring pigment in marine organisms and is essential to the photosynthetic light-harvesting function in brown alga and diatom. Fucoxanthin exhibits optical characteristics attributed to an intramolecular charge transfer (ICT) state that arises in polar environments due to the presence of the carbonyl group. In this study, we report the spectroscopic properties of fucoxanthin in methanol (polar and protic solvent) observed by femtosecond pump-probe measurements in the near-infrared region, where transient absorption associated with the optically allowed S2 (1(1)B u (+) ) state and stimulated emission from the strongly coupled S1/ICT state were observed following one-photon excitation to the S2 state. The results showed that the amplitude of the stimulated emission of the S1/ICT state increased with decreasing excitation energy, demonstrating that the fucoxanthin form associated with the lower energy of the steady-state absorption exhibits stronger ICT character.
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| http://dx.doi.org/10.1007/s11120-014-9995-6 | DOI Listing |
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