Photoexcited Singlet and Triplet States of a <scp>UV</scp> Absorber Ethylhexyl Methoxycrylene

Kikuchi, Azusa; Hata, Yutaka; Kumasaka, Ryo; Nanbu, Yuichi; Yagi, Mikio

doi:10.1111/php.12017

Cited by 23 publications

(32 citation statements)

References 47 publications

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“…In a mixture, such long-lived states could be reactive. Indeed, it is well known that some sunscreen blends incorporate the use of photostabilizers [165,166] to counter this. It is, therefore, crucial to explore these types of interactions.…”

Section: Discussionmentioning

confidence: 99%

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

2016

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The relationship between exposure to ultraviolet (UV) radiation and skin cancer urges the need for extra photoprotection, which is presently provided by widespread commercially available sunscreen lotions. Apart from having a large absorption cross section in the UVA and UVB regions of the electromagnetic spectrum, the chemical absorbers in these photoprotective products should also be able to dissipate the excess energy in a safe way, i.e. without releasing photoproducts or inducing any further, harmful, photochemistry. While sunscreens are tested for both their photoprotective capability and dermatological compatibility, phenomena occurring at the molecular level upon absorption of UV radiation are largely overlooked. To date, there is only a limited amount of information regarding the photochemistry and photophysics of these sunscreen molecules. However, a thorough understanding of the intrinsic mechanisms by which popular sunscreen molecular constituents dissipate excess energy has the potential to aid in the design of more efficient, safer sunscreens. In this review, we explore the potential of using gas-phase frequency- and time-resolved spectroscopies in an effort to better understand the photoinduced excited-state dynamics, or photodynamics, of sunscreen molecules. Complementary computational studies are also briefly discussed. Finally, the future outlook of expanding these gas-phase studies into the solution phase is considered.

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Section: Discussionmentioning

confidence: 99%

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

2016

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“…However, OCR has been reported to be nonfluorescent [37]. In the previous study, the energy level of the S 1 state of OCR was estimated to be 29,000 cm À 1 from the longer wavelength edge of the UV absorption spectrum [38]. The observed energy levels of the S 1 states are shown in Scheme 1.…”

Section: Uv Absorption Spectramentioning

confidence: 96%

Energy-donor phosphorescence quenching study of triplet–triplet energy transfer between UV absorbers

Kikuchi

Nakabai

Oguchi-Fujiyama

et al. 2015

Journal of Luminescence

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“…The ideal UV absorbers should ensure that the absorbed UV energy is transformed into vibrational energy without harmful reactions. Therefore, the nature of the photoexcited states of UV absorbers and their deactivation processes have been under active investigation (5)(6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Photoexcited States of UV Absorbers, Benzophenone Derivatives

Kumasaka

Kikuchi

Yagi

2014

Photochem & Photobiology

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The UV absorption, phosphorescence and phosphorescence-excitation spectra of benzophenone (BP) derivatives used as organic UV absorbers have been observed in rigid solutions at 77 K. The triplet-triplet absorption spectra have been observed in acetonitrile at room temperature. The BP derivatives studied are 2,2',4,4'-tetrahydroxybenzophenone (BP-2), 2-hydroxy-4-methoxybenzophenone (BP-3), 2,2'-dihydroxy-4,4'-dimethoxybenzophenone (BP-6), 5-chloro-2-hydroxybenzophenone (BP-7) and 2-hydroxy-4-n-octyloxybenzophenone (BP-12). The energy levels and lifetimes of the lowest excited triplet (T1 ) states of these BP derivatives were determined from the first peak of phosphorescence. The time-resolved near-IR emission spectrum of singlet oxygen generated by photosensitization with BP-7 was observed in acetonitrile at room temperature. BP-2, BP-3, BP-6 and BP-12 show photoinduced phosphorescence enhancement in ethanol at 77 K. The possible mechanism of the observed phosphorescence enhancement is discussed. The T1 states of 2-hydroxy-5-methylbenzophenone, 4-methoxybenzophenone and 2,4'-dimethoxybenzophenone have been studied for comparison.

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Photoexcited Singlet and Triplet States of a UV Absorber Ethylhexyl Methoxycrylene

Cited by 23 publications

References 47 publications

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

Photophysics of sunscreen molecules in the gas phase: a stepwise approach towards understanding and developing next-generation sunscreens

Energy-donor phosphorescence quenching study of triplet–triplet energy transfer between UV absorbers

Photoexcited States of UV Absorbers, Benzophenone Derivatives

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