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在有氧和无氧条件下杀菌剂百菌清的紫外光特性及光降解机制

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

作者信息

Cooke María Victoria, Oviedo María Belén, Peláez Walter José, Argüello Gustavo Alejandro

机构信息

INFIQC-CONICET-Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina.

INFIQC-CONICET-Dpto. de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina.

出版信息

Chemosphere. 2017 Nov;187:156-162. doi: 10.1016/j.chemosphere.2017.08.111. Epub 2017 Aug 30.

DOI:10.1016/j.chemosphere.2017.08.111
PMID:28846971
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.

摘要

对百菌清(CT)的紫外光谱进行了实验和理论研究,并首次给出了振动分辨的最高占据分子轨道(HOMO)到最低未占据分子轨道(LUMO)跃迁。还记录了荧光光谱。此外,制备性光解使得能够详细研究形成的光产物,并识别出不同的异构体。在有氧气存在的情况下,仅发生首次还原脱氯-脱氰反应,而在无氧情况下,则会发生连续的脱氯-脱氰反应。

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