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Theoretical studies on the mechanism, kinetics, and degradation pathways of auxin mimic herbicides by OH radical in aqueous media

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Abstract

The kinetics and mechanism in the oxidative degradation pathways of the OH radical reaction with seven auxin mimic aromatic acid-based herbicides were investigated with the help of various theoretical methods. Various global and local reactivity parameters such as ionization energy, molecular hardness, electrophilicity, condensed Fukui function, and total energies were determined to predict the reactivity of these herbicides towards the OH radical. Geometry optimization was performed at the CAM–B3LYP/6–311 + G(d) level of theory including the solvent effect using the polarizable continuum model (PCM) incorporating the integral equation formalism (IEF) with water as solvent. Single point energies of various species were calculated at ROMP2/aug–cc–pVDZ level of theory for better accuracy. The pKa values for these acid-based herbicides allow them to exist in the deprotonated form in aqueous condition. Hence, the calculations are also performed for the deprotonated form apart from the neutral species. The most reactive site for the OH radical reaction is predicted and validated for neutral and deprotonated species. Once the most reactive site is known, the reaction rate constants are calculated theoretically by the traditional transition–state theory using one-dimensional tunneling corrections. The solvent effect on the reaction rate constant is implemented through Collins–Kimball formulations.

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The various parameters of the molecular structure of the current study are available and can be obtained from the corresponding author on reasonable request.

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Acknowledgements

The author thanks Prof. G. Naresh Patwari for some of the calculations performed at IITBombay, Mumbai.

Funding

The work was supported by DAE under Project “26–XII–CR& D–117.03/Advanced Research on Laser–Induced Chemical Reactions.”

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As a single-author manuscript, starting from the conceptualization to theoretical calculation, writing, presentation, and figures, everything was handled by the author. For the remaining, it has been duly acknowledged.

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Correspondence to Hari P. Upadhyaya.

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Upadhyaya, H.P. Theoretical studies on the mechanism, kinetics, and degradation pathways of auxin mimic herbicides by OH radical in aqueous media. Struct Chem 34, 931–943 (2023). https://doi.org/10.1007/s11224-022-02055-2

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