Ultrafast Photoprotecting Sunscreens in Natural Plants

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• 作者：Lewis A. Baker ; Michael D. Horbury ; Simon E. Greenough ; Florent Allais ; Patrick S. Walsh ; Scott Habershon ; Vasilios G. Stavros
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：January 7, 2016
• 年：2016
• 卷：7
• 期：1
• 页码：56-61
• 全文大小：380K
• ISSN：1948-7185

文摘

We explore the ultrafast photoprotective properties of a series of sinapic acid derivatives in a range of solvents, utilizing femtosecond transient electronic absorption spectroscopy. We find that a primary relaxation mechanism displayed by the plant sunscreen sinapoyl malate and other related molecular species may be understood as a multistep process involving internal conversion of the initially photoexcited 1¹ππ* state along a trans–cis photoisomerization coordinate, leading to the repopulation of the original trans ground-state isomer or the formation of a stable cis isomer.