期刊
JOURNAL OF COORDINATION CHEMISTRY
卷 73, 期 17-19, 页码 2613-2620出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2020.1840562
关键词
Iron(III); TAML activators; hydrogen peroxide; microcystin-LR; oxidation; kinetics
资金
- EPA grant [SU83946101]
- NSF [DBI-9729351]
The bis-sulfonamide TAML activator of peroxides [Fe{4-NO2C6H3-1,2-(NCOCMe2 NSO2)(2)CHMe}](-) (2) catalyzes the H2O2 oxidation of microcystin-LR (m-LR), a common surface water contaminant produced by cyanobacteria that is toxic at very low concentrations. The major reaction product is by 16 Da heavier than m-LR, suggesting that the first oxidative step involves addition of oxygen to one of m-LRs three C = C units to form an epoxide. The kinetic data suggest that the m-LR -> m + 16 conversion occurs without any kinetically meaningful intermediate with the catalytic rate constant k (II) of 2.5 x 10(5) M-1 s(-1), which characterizes the interaction of m-LR with the oxidized, active form of the catalyst. The primary m + 16 product undergoes much slower further catalytic oxidation in the aqueous reaction medium. This communication describes a potential utility of TAML/H2O2 catalysis for microcystin detoxification that calls for further research.
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