Abstract
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.
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