Probing the ultrafast energy dissipation mechanism of the sunscreen oxybenzone after UVA irradiation

Lewis A. Baker, Michael D. Horbury, Simon E. Greenough, Philip M. Coulter, Tolga N V Karsili, Gareth M. Roberts, Andrew J. Orr-Ewing, Michael N R Ashfold*, Vasilios G. Stavros

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

61 Citations (Scopus)
507 Downloads (Pure)

Abstract

Oxybenzone is a common constituent of many commercially available sunscreens providing photoprotection from ultraviolet light incident on the skin. Femtosecond transient electronic and vibrational absorption spectroscopies have been used to investigate the nonradiative relaxation pathways of oxybenzone in cyclohexane and methanol after excitation in the UVA region. The present data suggest that the photoprotective properties of oxybenzone can be understood in terms of an initial ultrafast excited state enol → keto tautomerization, followed by efficient internal conversion and subsequent vibrational relaxation to the ground state (enol) tautomer.

Original languageEnglish
Pages (from-to)1363-1368
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume6
Issue number8
DOIs
Publication statusPublished - 26 Mar 2015

Bibliographical note

Date of Acceptance: 26/03/2015

Keywords

  • oxybenzone
  • sunscreens
  • transient absorption spectroscopy
  • ultrafast photochemistry

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