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UV characterization and photodegradation mechanism of the fungicide chlorothalonil in the presence and absence of oxygen

Author:
Cooke, María Victoria, Oviedo, María Belén, Peláez, Walter José, Argüello, Gustavo Alejandro
Source:
Chemosphere 2017 v.187 pp. 156-162
ISSN:
0045-6535
Subject:
chlorothalonil, isomers, oxygen, photolysis
Abstract:
An experimental and theoretical study of the UV spectrum of chlorothalonil (CT) was carried out and the vibrationally resolved HOMO→LUMO transition is presented for the first time. The fluorescence spectrum has also been recorded. Furthermore, preparative photolysis allowed a detailed study of the photoproducts formed with recognition of different isomers. In the presence of oxygen only the first reductive dechlorination-decyanation occurred, while in its absence a successive dechlorination-decyanation takes place.
Agid:
5815586