NDLI: Photochemical degradation of the UV filter octyl methoxycinnamate in solution and in aggregates.

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Photochemical degradation of the UV filter octyl methoxycinnamate in solution and in aggregates.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hanson, Kerry M. Narayanan, Swathi Nichols, Valerie M. Bardeen, Christopher J.
Description	Author Affiliation: Hanson KM ( Department of Chemistry, University of California, Riverside, Riverside, CA 92521, USA. christopher.bardeen@ucr.edu kerry.hanson@ucr.edu.)
Abstract	The photodegradation of the ultraviolet (UV) filter octyl methoxycinnamate (OMC) is investigated in both dilute solution and in aggregated form. In dilute solution, the ratio of trans and cis isomers achieved at the photostationary state is solvent-dependent because of variations in the isomerization quantum yield. The two isomeric forms at the photostationary state are highly resistant to further photodegradation and no other UVA-absorbing species are formed. Aggregation of OMC, either in a neat film or in aqueous colloidal suspensions, leads to irreversible photodegradation of the molecule and the formation of multiple photoproducts. In addition to previously identified photoproducts like the UVB-absorbing cis and trans isomers and photodimers, we find photoproduct species whose absorption extends into the UVA. Characterization of the photophysical properties of these species indicates that they have long-lived excited-states (τf > 1 ns, 400 nm), unlike the isomeric forms of OMC (τf < 30 ps, 266 nm), and that excitation at 405 nm can sensitize the formation of singlet oxygen. These results show that the environment of OMC affects the photochemistry of the molecule and that the environmental conditions must be taken into account when considering the molecule's stability. In particular, aggregation of OMC molecules results in complex photochemistry that can produce species whose absorption extends into UVA and are capable of generating reactive oxygen species.
File Format	HTM / HTML
ISSN	1474905X
Issue Number	9
Volume Number	14
e-ISSN	14749092
Journal	Photochemical & Photobiological Sciences
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-09-26
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Chemistry Discipline Biology Cinnamates Chemistry Radiation Effects Photolysis Sunscreening Agents Ultraviolet Rays Chromatography, High Pressure Liquid Colloids Cyclohexanes Fluorescence Methanol Molecular Structure Solutions Water Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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Correction: Photochemical degradation of the UV filter octyl methoxycinnamate in solution and in aggregates

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