Experimental and theoretical studies on the photodegradation of 2-ethylhexyl 4-methoxycinnamate in the presence of reactive oxygen and chlorine species

Alicja Gackowska; Maciej Przybyłek; Waldemar Studziński; Jerzy Gaca

doi:10.2478/s11532-014-0522-6

Experimental and theoretical studies on the photodegradation of 2-ethylhexyl 4-methoxycinnamate in the presence of reactive oxygen and chlorine species

Abstract

2-Ethylhexyl 4-methoxycinnamate (EHMC) is one of the most commonly used sunscreen ingredient. In this study we investigated photodegradation of EHMC in the presence of such common oxidizing and chlorinating systems as H2O2, H2O2/HCl, H2O2/UV, and H2O2/HCl/UV. Reaction products were detected by gas chromatography with a mass spectrometric detector (GC-MS). As a result of experimental studies chloro-substituted 4-methoxycinnamic acid (4-MCA), 4-methoxybenzaldehyde (4-MBA) and 4-methoxyphenol (4-MP) were identified. Experimental studies were enriched with DFT and MP2 calculations. We found that reactions of 4-MCA, 4-MBA and 4-MP with Cl2 and HOCl were in all cases thermodynamically favorable. However, reactivity indices provide a better explanation of the formation of particular chloroorganic compounds. Generally, those isomeric forms of mono- and dichlorinated compounds which exhibits the highest hardness were identified. Nucleophilicity of the chloroorganic compounds precursors were examined by means of the Fukui function.

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Authors (4)

Alicja Gackowska
Maciej Przybyłek Dr
Waldemar Studziński
Jerzy Gaca

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Category:: Magazine publication
Type:: Magazine publication
Published in:: CENTRAL EUROPEAN JOURNAL OF CHEMISTRY no. 12, edition 5, pages 612 - 623,
ISSN: 1895-1066
Publication year:: 2014
DOI:: Digital Object Identifier (open in new tab) 10.2478/s11532-014-0522-6
Verified by:: No verification