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Updated: May 30, 2025

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Decoding the excited-state dynamics of carbonyl-containing carotenoids: Insights from the Ind series
Daisuke Kosumi1, Toshiyuki Kusumoto2, Hideki Hashimoto3
1Institute of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
Abstract:
Carotenoids are naturally occurring pigments essential for both light-harvesting and photoprotection in photosynthetic processes. Among these, carbonyl-containing carotenoids exhibit distinctive excited state properties due to the presence of intramolecular charge transfer (ICT) in their excited states. In this study, we synthesized a novel family of carotenoid analogs with varying numbers of conjugated double bonds, denoted as the Ind series, and conducted femtosecond pump-probe spectroscopy on these molecules in both acetone and n-hexane. The objective was to elucidate how the excited-state dynamics depend on the conjugation length. The spectroscopic characterization of the Ind series revealed several unique features: the observation of stimulated emission from the 1Ag-/ICT state, the emergence of the 1nπ∗ state, triplet state formation mediated by the 1nπ∗ state, and an anomalous solvent dependence of the 1Ag-/ICT state lifetimes. The relationship between conjugation length and excited state dynamics, as well as the ICT character of the Ind series, are thoroughly discussed.
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