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• W4312113445 abstract "Aqueous solubility and stability often limit the application of aminophenoxazinones and their sulfur mimics as promising agrochemicals in a sustainable agriculture inspired by allelopathy. This paper presents a solution to the problem using host–guest complexation with cucurbiturils (CBn). Computational studies show that CB7 is the most suitably sized homologue due to its strong affinity for guest molecules and its high water solubility. Complex formation has been studied by direct titrations monitored using UV–vis spectroscopy, finding a preferential interaction with protonated aminophenoxazinone species with high binding affinities (CB7·APOH+, Ka = (1.85 ± 0.37) × 106 M–1; CB7·DiS-NH3+, Ka = (3.91 ± 0.53) × 104 M–1; and DiS-(NH3+)2, Ka= (1.27 ± 0.42) × 105 M–1). NMR characterization and stability analysis were also performed and revealed an interesting pKa modulation and stabilization by cucurbiturils (2-amino-3H-phenoxazin-3-one (APO), pKa = 2.94 ± 0.30, and CB7·APO, pKa = 4.12 ± 0.15; 2,2′-disulfanediyldianiline (DiS-NH2), pKa = 2.14 ± 0.09, and CB7·DiS-NH2, pKa = 3.26 ± 0.09), thus favoring applications in different kinds of crop soils. Kinetic studies have demonstrated the stability of the CB7·APO complex at different pH media for more than 90 min. An in vitro bioassay with etiolated wheat coleoptiles showed that the bioactivity of APO and DiS-NH2 is enhanced upon complexation." @default.
• W4312113445 created "2023-01-04" @default.
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• W4312113445 date "2022-12-22" @default.
• W4312113445 modified "2023-10-15" @default.
• W4312113445 title "Stability and p<i>K</i>_a Modulation of Aminophenoxazinones and Their Disulfide Mimics by Host–Guest Interaction with Cucurbit[7]uril. Direct Applications in Agrochemical Wheat Models" @default.
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• W4312113445 doi "https://doi.org/10.1021/acs.jafc.2c06373" @default.
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