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Volume 14, Issue 3, Pages 141-146

Spectroscopic scale protection factor (SSPF) of solar ultraviolet radiation molecular screens. II. Substituent effect on salicylideneaniline

Raúl G. E. Morales, Alexis Hidrobo, and Gregorio P. Jara

Laboratory of Luminescence and Molecular Structure, Department of Chemistry and Center for Environmental Chemistry, Faculty of Sciences, University of Chile, casilla 653, Santiago, Chile

Received 9 February 2000; Accepted 22 February 2000

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Salicylideneanilines present a broad absorption band and a high molar absorption coefficient in the UV-A and UV-B regions. In addition, they are photostable compounds to the solar radiation exposition. Therefore, we have recently established their potential use as a solar ultraviolet radiation molecular screens.

In the present work we have determined the dependence of the Spectroscopic Scale Protection Factor (SSPF) values with the substituent effect on the aniline ring of the salicylidene, when the substituent is an electron-acceptor group (–CN, –COCH3, –NO2) and we have compared this effect with and without an electron-donor group (–OCH3) at para position in the salicylidene ring.

In order to determine and compare these SSPF values versus the usual Sun Protection Factor (SPF) values, a relative scale of biological nature, we have determined the electronic absorption spectra of these substituted salicylideneaniline compounds, and we have compared these spectroscopic data with homosalate, as an SPF standard compound. Our results are conclusive respect to determine the salicylideneanilines as a new family of molecular species highly efficient in the molecular screen role.