J Phys Chem Lett 2017 Apr 28:2113-2118. Epub 2017 Apr 28.
Department of Chemistry and ‡Centre for Scientific Computing, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.
The ultrafast photoprotection mechanisms in operation in ethylhexyl triazone (EHT, octyl triazone), an approved ultraviolet-B (UV-B) chemical filter for commercial sunscreens, remain elusive, with a notable absence of ultrafast time-resolved measurements. These large organic molecules are of increasing interest as they are suspected to be less likely to penetrate the skin than some of the smaller approved filters, thereby reducing the possible adverse effects from sunscreen products. We apply femtosecond transient absorption spectroscopy with electronic structure calculations to unravel the complete photodeactivation mechanism that EHT undergoes after UV-B irradiation. Read More