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Insight into the photodynamics of photostabilizer molecules
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Abiola, Temitope T., Rioux, Benjamin, Johal, Sharanjit, Mention, Matthieu M., Brunissen, Fanny, Woolley, Jack Matthew, Allais, Florent and Stavros, Vasilios G. (2022) Insight into the photodynamics of photostabilizer molecules. The Journal of Physical Chemistry A, 126 (45). pp. 8388-8397. doi:10.1021/acs.jpca.2c05580 ISSN 1520-5215.
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Official URL: https://doi.org/10.1021/acs.jpca.2c05580
Abstract
Solar exposure of avobenzone, one of the most widely used commercial UVA filters on the market, is known to cause significant degradation. This finding has fueled research into developing photostabilizer molecules. In an effort to provide insight into their stand-alone photoprotection properties, the excited state dynamics of the photostabilizer, 3-(3,4,5-trimethoxybenzylidene) pentane-2,4-dione (TMBP), and its phenolic derivative, 3-(4-hydroxy-3,5-dimethoxybenzylidene) pentane-2,4-dione (DMBP), were studied with ultrafast transient absorption spectroscopy. Solutions of TMPB and DMBP in ethanol and in an industry-standard emollient, as well as TMBP and DMBP deposited on synthetic skin mimic, were investigated. These experiments were allied with computational methods to aid interpretation of the experimental data. Upon photoexcitation, these photostabilizers repopulate the electronic ground state via nonradiative decay within a few picoseconds involving a twisted intramolecular charge transfer configuration in the excited state, followed by internal conversion and subsequent vibrational cooling in the ground state. This finding implies that, aside from acting as a photostabilizer to certain UV filters, TMBP and DMBP may offer additional photoprotection in a sunscreen formulation as a stand-alone UV filter. Finally, TMBP and DMBP could also find applications as molecular photon-to-heat converters.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | |||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Sunscreens (Cosmetics) -- Molecular aspects, Photochemistry, Ultraviolet radiation | |||||||||||||||
Journal or Publication Title: | The Journal of Physical Chemistry A | |||||||||||||||
Publisher: | American Chemical Society | |||||||||||||||
ISSN: | 1520-5215 | |||||||||||||||
Official Date: | 17 November 2022 | |||||||||||||||
Dates: |
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Volume: | 126 | |||||||||||||||
Number: | 45 | |||||||||||||||
Page Range: | pp. 8388-8397 | |||||||||||||||
DOI: | 10.1021/acs.jpca.2c05580 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
Copyright Holders: | Copyright © 2022 The Authors. Published by American Chemical Society | |||||||||||||||
Date of first compliant deposit: | 2 December 2022 | |||||||||||||||
Date of first compliant Open Access: | 2 December 2022 | |||||||||||||||
RIOXX Funder/Project Grant: |
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