Photooxidation of Aniline Derivatives Can Be Activated by Freezing Their Aqueous Solutions

0483886 - ÚOCHB 2018 RIV US eng J - Článek v odborném periodiku
Corrochano, P. - Nachtigallová, Dana - Klán, P.
Photooxidation of Aniline Derivatives Can Be Activated by Freezing Their Aqueous Solutions.
Environmental Science and Technology. Roč. 51, č. 23 (2017), s. 13763-13770. ISSN 0013-936X. E-ISSN 1520-5851
Grant CEP: GA ČR(CZ) GA15-12386S
Institucionální podpora: RVO:61388963
Klíčová slova: air-ice interface * experimental-computational approach * dissolved organic matter
Obor OECD: Physical chemistry
Impakt faktor: 6.653, rok: 2017

A combined experimental and computational approach was, used to investigate the spectroscopic properties of three different aniline derivatives (aniline, N,N-dimethylaniline, and N,N-diethylaniline) in aqueous solutions and at the air-ice interface in the temperature range of 243-298 K The absorption and diffuse reflectance spectra of ice samples prepared by different techniques, such as slow or shock freezing of the aqueous solutions or vapor deposition on ice grains, exhibited unequivocal bathochromic shifts of 10-15 nm of the absorption maxima of anilines in frozen samples compared to those in liquid aqueous solutions. DFT and SCS-ADC(2) calculations showed that contaminant contaminant and contaminant-ice interactions are responsible for these shifts. Finally, we demonstrate that irradiation of anilines in the presence of a hydrogen peroxide/O-2 system by wavelengths that overlap only with the red-shifted absorption tails of anilines in frozen samples (while having a marginal overlap with their spectra in liquid solutions) can almost exclusively trigger a photochemical oxidation process. Mechanistic and environmental considerations are discussed.
Trvalý link: http://hdl.handle.net/11104/0279054