Abstract
Photoisomerisation has been shown to be an efficient excited-state relaxation mechanism for a variety of nature-based and artificial-based molecular systems. Here we report on the excited-state relaxation dynamics and consequent photostability of a symmetrically functionalised cinnamate by transient electronic absorption spectroscopy, along with complementary computational and steady-state spectroscopy methods. The findings are then discussed in comparison to 2-ethylhexyl-E-4-methoxycinnamate, a structurally related 'off the shelf' chemical filter present in commercial sunscreens with a similar absorption profile. The present study allows for a like-for-like comparison beween 2-ethylhexyl-E-4-methoxycinnamate and the functionalised cinnamate, driven by the need to enhance solar protection across both the UVA and UVB regions of the electromagnetic spectrum.
Highlights
Overexposure to ultraviolet radiation (UVR) is an increasing concern in today’s Society.[1,2,3,4,5] Chemical filters, found in commercial formulations, have been designed to allay such overexposure.[6]
T1 for acetonitrile is significantly shorter than that of either ethanol or cyclohexane, as has previously been reported for similar systems.[42,43]. This encompasses any geometry rearrangement of solute and surrounding solvent. This geometry rearrangement is not thought to involve a change in the electronic state.[16,44] t2 describes the evolution of excited-state population, as it moves towards an S1/S0 conical intersection along the E - Z isomerisation coordinate and funnels through this conical intersection
This study highlights the effect of chemical substitution on an established photoisomerisation pathway
Summary
Overexposure to ultraviolet radiation (UVR) is an increasing concern in today’s Society.[1,2,3,4,5] Chemical filters, found in commercial formulations, have been designed to allay such overexposure.[6]. These reports follow a growing trend of chemical filters with harmful photoproducts, both to humans and the environment, triggered by photoexcitation.[24,25,26,27] As such, there is mounting impetus to develop ‘safer’ chemical filters for use in formulations, such as derivatives of commercial chemical filters
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