期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 18, 期 26, 页码 17691-17697出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp01595f
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资金
- University of Warwick
- EPSRC through the Molecular Organisation and Assembly in Cells Doctoral Training Centre [EP/F500378/1]
- Warwick Institute of Advanced Studies
- EPSRC [EP/J007153]
- Royal Society
- Engineering and Physical Sciences Research Council [1349950, 1229155] Funding Source: researchfish
The dynamics of ferulic acid (3-(4-hydroxy-3-methoxyphenyl)-2-propenoic acid) and caffeic acid (3-(3,4-dihydroxyphenyl)-2-propenoic acid) in acetonitrile, dioxane and water at pH 2.2 following photoexcitation to the first excited singlet state are reported. These hydroxycinnamic acids display both strong ultraviolet absorption and potent antioxidant activity, making them promising sunscreen components. Ferulic and caffeic acids have previously been shown to undergo trans-cis photoisomerization via irradiation studies, yet time-resolved measurements were unable to observe formation of the cis-isomer. In the present study, we are able to observe the formation of the cis-isomer as well as provide timescales of relaxation following initial photoexcitation.
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