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The photo-degradation of mesotrione, a triketone herbicide, in the presence of CuII ions

Paper ID Volume ID Publish Year Pages File Format Full-Text
26437 43952 2016 11 PDF Available
Title
The photo-degradation of mesotrione, a triketone herbicide, in the presence of CuII ions
Abstract

•CuII ions bind to mesotrione in bidentate mode.•Three of the transitions of the complex are ligand-to-ligand electron transfer.•The lowest-energy transition of the complex involves a LMCT.•The photochemical degradation of mesotrione arises from its triplet excited state.•By exciting in the LMCT absorption band of the complex, a photo-cyclisation occurs.

The study focuses first on the complexation of CuII ions with mesotrione. Experimental absorption spectra combined with quantum chemical calculations highlight that CuII ions bind to the molecule in bidentate mode between O1 and O7 atoms. The calculated electronic transitions of the complex show that three of them are mostly ligand-to-ligand electron transfer while the lowest-energy one involves a ligand-to-metal charge transfer (LMCT). The second aim of this work is to explore the effect of CuII complexation on the photo-degradation of mesotrione. The kinetics and mechanisms of the reactions are proposed on the basis of the experimental results. The effect of different parameters such as the irradiation wavelength, the oxygen concentration and the pH of the mixture and also the production of reactive species such as hydroxyl radicals is investigated. The photochemical degradation of mesotrione in water arises from the triplet excited state of the molecule and results in a photo-hydrolysis process. For the complex, by exciting mainly in its LMCT absorption band, an electron transfer between copper and mesotrione probably occurs and the mechanism of mesotrione-CuII photo-degradation differs: in addition to the photo-hydrolysis route, a photo-cyclisation process takes place and the oxidation of the ligand is accompanied by the reduction of CuII ions.

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Keywords
Mesotrione; Pesticide; CuII complex; Photo-degradation; Mechanism
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The photo-degradation of mesotrione, a triketone herbicide, in the presence of CuII ions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 315, 15 January 2016, Pages 76–86
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us