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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2021

New Generation UV-A Filters: Understanding Their Photodynamics on a Human Skin Mimic

Josene M Toldo
Mario Barbatti

Résumé

The sparsity of efficient commercial ultraviolet-A (UV-A) filters is a major challenge toward developing effective broadband sunscreens with minimal human-and eco-toxicity. To combat this, we have designed a new class of Meldrum-based phenolic UV-A filters. We explore the ultrafast photodynamics of coumaryl Meldrum, CMe, and sinapyl Meldrum (SMe), both in an industry-standard emollient and on a synthetic skin mimic, using femtosecond transient electronic and vibrational absorption spectroscopies and computational simulations. Upon photoexcitation to the lowest excited singlet state (S 1), these Meldrum-based phenolics undergo fast and efficient nonradiative decay to repopulate the electronic ground state (S 0). We propose an initial ultrafast twisted intramolecular charge-transfer mechanism as these systems evolve out of the Franck−Condon region toward an S 1 /S 0 conical intersection, followed by internal conversion to S 0 and subsequent vibrational cooling. Importantly, we correlate these findings to their long-term photostability upon irradiation with a solar simulator and conclude that these molecules surpass the basic requirements of an industry-standard UV filter.
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Origine : Publication financée par une institution
Licence : CC BY - Paternité

Dates et versions

hal-04153255 , version 1 (06-07-2023)

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Paternité

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Temitope T Abiola, Natércia D N Rodrigues, Casey Ho, Daniel J L Coxon, Michael D Horbury, et al.. New Generation UV-A Filters: Understanding Their Photodynamics on a Human Skin Mimic. Journal of Physical Chemistry Letters, 2021, 12 (1), pp.337 - 344. ⟨10.1021/acs.jpclett.0c03004⟩. ⟨hal-04153255⟩
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