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1 July 2000 The Photophysical Properties of Menthyl Anthranilate: A UV-A Sunscreen
Andrew Beeby, Allison E. Jones
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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 (Φf = 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 (ΦΔ) determined by time-resolved near-infrared luminescence measurements were determined to be in the range 0.09–0.12 for all systems.

Andrew Beeby and Allison E. Jones "The Photophysical Properties of Menthyl Anthranilate: A UV-A Sunscreen," Photochemistry and Photobiology 72(1), 10-15, (1 July 2000).<0010:TPPOMA>2.0.CO;2
Received: 20 January 2000; Accepted: 1 March 2000; Published: 1 July 2000

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