Spectroscopic scale protection factor (SSPF) of solar ultraviolet radiation molecular screens.: I. Salicylidene compounds

We have found a new absolute scale of solar ultraviolet radiation protection factor for molecular screens, called spectroscopic scale protection factor (SSPF). This scale, based on the solar-action spectra of these molecular screens, is obtained under a 20° zenith angle of the sun actinic flux spect...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1998-12, Vol.119 (2), p.143-146
Main Authors: Morales, Raúl G.E., Jara, Gregorio P., Vargas, Vı́ctor
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Molecular screens
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Salicylidenes
Solar actinic flux
Spectral bands
Sun protection factor (SPF)
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Summary:We have found a new absolute scale of solar ultraviolet radiation protection factor for molecular screens, called spectroscopic scale protection factor (SSPF). This scale, based on the solar-action spectra of these molecular screens, is obtained under a 20° zenith angle of the sun actinic flux spectra at the earth's surface. In order to compare this scale versus the usual sun protection factor (SPF) scale which uses homosalate (SPF = 4.2) as a standard compound, we have determined the electronic absorption spectral properties of a salicylidene compound series. Since these aromatic compounds present a good photostability behavior, a broad absorption band and a high molar absorption coefficient in the UV-A and UV-B regions, we have established their potential use as a solar ultraviolet radiation molecular screen according to the SSPF data.
ISSN:1010-6030
1873-2666
DOI:10.1016/S1010-6030(98)00396-7