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Bottom-up excited state dynamics of two cinnamate-based sunscreen filter molecules
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Peperstraete, Yoann, Staniforth, Michael, Baker, Lewis A., Rodrigues, Natércia D. N., Cole-Filipiak, Neil C., Quan, Wen-Dong and Stavros, Vasilios G. (2016) Bottom-up excited state dynamics of two cinnamate-based sunscreen filter molecules. Physical Chemistry Chemical Physics, 18 (40). pp. 28140-28149. doi:10.1039/C6CP05205C ISSN 1463-9076.
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Official URL: http://dx.doi.org/10.1039/C6CP05205C
Abstract
Methyl-E-4-methoxycinnamate (E-MMC) is a model chromophore of the commonly used commercial sunscreen agent, 2- ethylhexyl-E-4-methoxycinnamate (E-EHMC). In an effort to garner a molecular-level understanding of the photoprotection mechanisms in operation with E-EHMC, we have used time-resolved pump-probe spectroscopy to explore E-MMC’s and E-EHMC’s excited state dynamics upon UV-B photoexcitation to the S1 (11ππ*) state in both the gas- and solution-phase. In the gas-phase, our studies suggest that the excited state dynamics are driven by non-radiative decay from the 11ππ* to the S3 (11nπ*) state, followed by de-excitation from the 11nπ* to the ground electronic state (S0). Using both a non-polar-aprotic solvent, cyclohexane, and a polar-protic solvent, methanol, we investigated E-MMC and EEHMC’s photochemistry in a more realistic, ‘closer-to-shelf’ environment. A stark change to the excited state dynamics in the gas-phase is observed in the solution-phase suggesting that the dynamics are now driven by efficient E/Z isomerisation from the initially photoexcited 11ππ*state to S0.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QD Chemistry R Medicine > RS Pharmacy and materia medica |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Research Centres > Molecular Organisation and Assembly in Cells (MOAC) |
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Library of Congress Subject Headings (LCSH): | Photochemistry , Sunscreens (Cosmetics) | ||||||||
Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||||||
Publisher: | Royal Society of Chemistry | ||||||||
ISSN: | 1463-9076 | ||||||||
Official Date: | 22 September 2016 | ||||||||
Dates: |
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Volume: | 18 | ||||||||
Number: | 40 | ||||||||
Page Range: | pp. 28140-28149 | ||||||||
DOI: | 10.1039/C6CP05205C | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 26 October 2016 | ||||||||
Date of first compliant Open Access: | 23 February 2017 | ||||||||
Funder: | École normale supérieure (France) , Engineering and Physical Sciences Research Council (EPSRC), Leverhulme Trust (LT), Royal Society (Great Britain) | ||||||||
Grant number: | EP/F500378/1, EP/J007153 (EPSRC) |
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