NDLI: Excited state properties of β-carotene analogs incorporating a lactone ring

Content Provider	Royal Society of Chemistry (RSC)
Author	Kosumi, Daisuke Kajikawa, Takayuki Katsumura, Shigeo Sakaguchi, Kazuhiko Hashimoto, Hideki
Copyright Year	2017
Abstract	Carotenoids possessing a carbonyl group along their polyene backbone exhibit unique excited state properties due to the occurrence of intramolecular charge transfer (ICT) in the excited state. In fact, the ICT characteristics of naturally occurring carbonyl carotenoids play an essential role in the highly efficient energy transfer that proceeds in aquatic photosynthetic antenna systems. In the present study, we synthesized two short-chain polyene carotenoids incorporating a lactone ring, denoted as BL-7 and BL-8, having seven and eight conjugated double bonds (n = 7 and 8), respectively. The excited state properties of these compounds were directly compared to those of their non-carbonyl counterparts to clarify the role of the carbonyl group in the generation of ICT. The energies of the optically allowed S2 states for BL-7 and BL-8 were found to be more than 0.3 eV (2400 cm−1) below those of non-carbonyl short β-carotene homologs. Ultrafast spectroscopic data demonstrated various solvent polarity-induced effects, including the appearance of stimulated emission in the near-IR region in the case of BL-7, and significant lifetime shortening of the lowest-lying singlet S1 excited states of both BL-7 and BL-8. These results suggest that these compounds exhibit ICT characteristics.
Starting Page	3000
Ending Page	3009
Page Count	10
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	4
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp06828f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Beta-Carotene Stimulated emission Polyene Electronvolt Lactone ICT Carbonyl group Photosynthesis Solvent
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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