Baker Lewis A, Horbury Michael D, Greenough Simon E, Coulter Philip M, Karsili Tolga N V, Roberts Gareth M, Orr-Ewing Andrew J, Ashfold Michael N R, Stavros Vasilios G
†Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom.
‡School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, United Kingdom.
J Phys Chem Lett. 2015 Apr 16;6(8):1363-8. doi: 10.1021/acs.jpclett.5b00417. Epub 2015 Mar 30.
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.
氧苯酮是许多市售防晒霜的常见成分，可对入射到皮肤上的紫外线提供光保护。飞秒瞬态电子吸收光谱和振动吸收光谱已被用于研究氧苯酮在环己烷和甲醇中于UVA区域激发后的非辐射弛豫途径。目前的数据表明，氧苯酮的光保护特性可以从最初的超快激发态烯醇→酮互变异构来理解，随后是有效的内转换以及随后向基态（烯醇）互变异构体的振动弛豫。
