Central European Journal of Chemistry

, Volume 12, Issue 5, pp 612–623

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
Research Article

DOI: 10.2478/s11532-014-0522-6

Cite this article as:
Gackowska, A., Przybyłek, M., Studziński, W. et al. cent.eur.j.chem. (2014) 12: 612. doi:10.2478/s11532-014-0522-6

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.
https://static-content.springer.com/image/art%3A10.2478%2Fs11532-014-0522-6/MediaObjects/11532_2014_522_Fig1_HTML.gif

Keywords

2-ethylhexyl 4-methoxycinnamateChlorinationOxidationPhotodegradationStability

Copyright information

© Versita Warsaw and Springer-Verlag Wien 2014

Authors and Affiliations

  • Alicja Gackowska
    • 1
  • Maciej Przybyłek
    • 2
  • Waldemar Studziński
    • 1
  • Jerzy Gaca
    • 1
  1. 1.Faculty of Chemical Technology and EngineeringUniversity of Technology and Life ScienceBydgoszczPoland
  2. 2.Department of Physical Chemistry, Collegium MedicumNicolaus Copernicus UniversityBydgoszczPoland