Quenching of an Aniline Radical Cation by Dissolved Organic Matter and Phenols: A Laser Flash Photolysis Study
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00114580" target="_blank" >RIV/00216224:14310/20:00114580 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1021/acs.est.0c05230" target="_blank" >https://doi.org/10.1021/acs.est.0c05230</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.est.0c05230" target="_blank" >10.1021/acs.est.0c05230</a>
Alternative languages
Result language
angličtina
Original language name
Quenching of an Aniline Radical Cation by Dissolved Organic Matter and Phenols: A Laser Flash Photolysis Study
Original language description
Aromatic amines are relevant aquatic organic contaminants whose photochemical transformation is affected by dissolved organic matter (DOM). The goal of this study is to elucidate the underlying mechanism of the inhibitory effect of DOM on such reactions. The selected model aromatic amine, 4-(dimethylamino)benzonitrile (DMABN), was subjected to laser flash photolysis in the presence and absence of various model photosensitizers. The produced radical cation (DMABN(.+)) was observed to react with several phenols and different types of DOM on a time scale of similar to 100 mu s. The determined second-order rate constants for the quenching of DMABN(.+) by phenols were in the range of (1.4-26) X 10(8) M-1 s(-1) and increased with increasing electron donor character of the aromatic ring substituent. For DOM, quenching rate constants increased with the phenolic content of the DOM. These results indicate the reduction of DMABN(.+) to re-form its parent compound as the basic reaction governing the inhibitory effect. In addition, the photosensitized oxidation of the sulfonamide antibiotic sulfadiazine (SDZ) was studied. The observed radical intermediate of SDZ was quenched by 4-methoxyphenol less effectively than DMABN(.+), which was attributed to the lower reduction potential of the SDZ-derived radical compared to DMABN(.+).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
<a href="/en/project/GA19-08239S" target="_blank" >GA19-08239S: The Spectroscopy and Microscopy of Chemical Compounds in Ice within the Environmental and Pharmaceutical Domains</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Environmental Science and Technology
ISSN
0013-936X
e-ISSN
1520-5851
Volume of the periodical
54
Issue of the periodical within the volume
23
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
15057-15065
UT code for WoS article
000596728600032
EID of the result in the Scopus database
2-s2.0-85096560900