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Broadband ultrafast photoprotection by oxybenzone across the UVB and UVC spectral regions
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Baker, Lewis A., Horbury, Michael D., Greenough, Simon E., Ashfold, Michael N. R. and Stavros, Vasilios G. (2015) Broadband ultrafast photoprotection by oxybenzone across the UVB and UVC spectral regions. Photochemical & Photobiological Sciences, 14 (10). pp. 1814-1820. doi:10.1039/C5PP00217F
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Official URL: http://dx.doi.org/10.1039/C5PP00217F
Abstract
Recent studies have shed light on the energy dissipation mechanism of oxybenzone, a common ingredient in commercial sunscreens. After UVA photoexcitation, the dissipation mechanism may be understood in terms of an initial ultrafast excited state enol -> keto tautomerisation, followed by nonadiabatic transfer to the ground electronic state and subsequent collisional relaxation to the starting enol tautomer. We expand on these studies using femtosecond transient electronic absorption spectroscopy to understand the non-radiative relaxation pathways of oxybenzone in cyclohexane and in methanol after UVB and UVC excitation. We find that the relaxation pathway may be understood in the same way as when exciting in the UVA region, concluding that oxybenzone displays proficient broadband non-radiative photoprotection, and thus photophysically justifying its inclusion in sunscreen mixtures.
| 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): | Sunscreens (Cosmetics), Photochemistry | ||||||||
| Journal or Publication Title: | Photochemical & Photobiological Sciences | ||||||||
| Publisher: | Royal Society of Chemistry | ||||||||
| ISSN: | 1814-1820 | ||||||||
| Official Date: | 11 August 2015 | ||||||||
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| Volume: | 14 | ||||||||
| Number: | 10 | ||||||||
| Page Range: | pp. 1814-1820 | ||||||||
| DOI: | 10.1039/C5PP00217F | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
| Copyright Holders: | Royal Society of Chemistry | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), University of Warwick. Institute of Advanced Study (IAS) | ||||||||
| Grant number: | EP/F500378/1, EP/L005913, EP/J007153 (EPSRC) |
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