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The Photophysical Properties of Menthyl Anthranilate: A UV‐A Sunscreen ¶
Author(s) -
Beeby Andrew,
Jones Allison E.
Publication year - 2000
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/0031-8655(2000)0720010tppoma2.0.co2
Subject(s) - phosphorescence , photochemistry , singlet oxygen , solvent , luminescence , triplet state , absorption (acoustics) , fluorescence , chemistry , quenching (fluorescence) , excited state , singlet state , oxygen , ultrafast laser spectroscopy , absorption spectroscopy , materials science , spectroscopy , molecule , organic chemistry , optoelectronics , optics , atomic physics , physics , quantum mechanics , composite material
The results of a comprehensive investigation of the photophysical properties of the sunscreen agent menthyl anthranilate in various solvent systems are reported. Luminescence studies reveal that this ester is highly fluorescent (Φ f = 0.64 ± 0.06 in ethanol) and has a solvent‐dependent emission maximum in the range of 390–405 nm. Phosphorescence has also been detected in low‐temperature glasses with an emission maximum at 445 nm and a lifetime of 2.5 s. Kinetic UV–visible absorption measurements revealed a transient species with absorption maxima at 480 nm and solvent‐dependent lifetimes of 26–200 μs that are attributed to the triplet state. The triplet state is efficiently quenched by oxygen, leading to the formation of singlet oxygen in all of the solvent systems studied. The singlet‐oxygen quantum yields (Φ Δ ) determined by time‐resolved near‐infrared luminescence measurements were determined to be in the range 0.09–0.12 for all systems.