Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 20, Pages 4833-4840Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c00851
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Funding
- MIUR PRIN [2017A4XRCA]
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By characterizing fucoxanthin with 2DES, researchers can reveal its ultrafast relaxation dynamics and focus on the photophysical properties of the intramolecular charge-transfer state. These results are significant for unraveling the dynamics of the electronic state manifold of carotenoids.
The electronic state manifolds of carotenoids and their relaxation dynamics are the object of intense investigation because most of the subtle details regulating their photophysics are still unknown. In order to contribute to this quest, here, we present a solvent-dependent 2D Electronic Spectroscopy (2DES) characterization of fucoxanthin, a carbonyl carotenoid involved in the light-harvesting process of brown algae. The 2DES technique allows probing its ultrafast relaxation dynamics in the first 1000 fs after photoexcitation with a 10 fs time resolution. The obtained results help shed light on the dynamics of the first electronic state manifold and, in particular, on an intramolecular charge-transfer state (ICT), whose photophysical properties are particularly elusive given its (almost) dark nature.
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