Exploring the Photochemistry of an Ethyl Sinapate Dimer: An Attempt Toward a Better Ultraviolet Filter

Michael D Horbury (1) , Matthew a P Turner (2) , Jack S Peters (3) , Matthieu Mention (4, 5) , Amandine Flourat (4, 5) , Nicholas D M Hine (2) , Florent Allais (4, 5) , Vasilios G Stavros (2)

1 University of Leeds
2 Department of Chemistry [University of Warwick]
3 University of Oxford
4 ABI - Agro-Biotechnologies Industrielles
5 CEBB - Centre Européen de Biotechnologies et Bioéconomie

The photochemistry and photostability of a potential ultraviolet (UV) radiation filter, dehydrodiethylsinapate, with a broad absorption in the UVA region, is explored utilizing a combination of femtosecond time-resolved spectroscopy and steady-state irradiation studies. The time-resolved measurements show that this UV filter candidate undergoes excited state relaxation after UV absorption on a timescale of ∼10 picoseconds, suggesting efficient relaxation. However, steady-state irradiation measurements show degradation under prolonged UV exposure. From a photochemical standpoint, this highlights the importance of considering both the ultrafast and "ultraslow" timescales when designing new potential UV filters.

Mots clés: photoprotection; femtosecond; sinapates; photochemistry; spectroscopy

Domaines: Chimie théorique et/ou physique

Michael D Horbury, Matthew a P Turner, Jack S Peters, Matthieu Mention, Amandine Flourat, et al.. Exploring the Photochemistry of an Ethyl Sinapate Dimer: An Attempt Toward a Better Ultraviolet Filter. Frontiers in Chemistry, 2020, 8, pp.633. ⟨10.3389/fchem.2020.00633⟩. ⟨hal-03473130⟩