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

COOKE, MARÍA VICTORIA; OVIEDO, MARÍA BELÉN; PELÁEZ, WALTER JOSÉ; ARGÜELLO, GUSTAVO ALEJANDRO

CHEMOSPHERE

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2017 vol. 187 p. 156 - 156

0045-6535

n 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.