Catalytic effect of tetrasulfonated cobalt phthalocyanine on selenite reduction by dithionite
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This works reports that tetrasulfonated cobalt(II) phthalocyanine (Co(II)TSPc) catalyzes reduction of selenite (SeO32−), the one of the most toxic form of selenium, to slightly toxic Se(0) by dithionite (S2O42−) in neutral aqueous solutions. The overall reaction mechanism involves rapid reduction of Co(II)TSPc to Co(I)TSPc by dithionite followed by slower oxidation of Co(I)TSPc by selenite. Reaction of Co(I)TSPc with selenite proceeds via two consecutive steps, i.e. the formation of complex between reactants followed by electron transfer from Co(I)-ion to selenite and dissociation of reduced selenite species from Co(II)-ion.
KeywordsSelenium Tetrasulfonated cobalt phthalocyanine Selenite Dithionite Catalysis
This work was supported by grant of Council on grants of the President of the Russian Federation for state support of young Russian researchers (project MК-1083.2019.3).
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Conflict of interest
The authors declare that they have no conflict of interest.
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