Catalytic effect of tetrasulfonated cobalt phthalocyanine on selenite reduction by dithionite

This works reports that tetrasulfonated cobalt(II) phthalocyanine (Co(II)TSPc) catalyzes reduction of selenite (SeO 3 2− ), the one of the most toxic form of selenium, to slightly toxic Se(0) by dithionite (S 2 O 4 2− ) in neutral aqueous solutions. The overall reaction mechanism involves rapid redu...

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Bibliographic Details
Published inReaction kinetics, mechanisms and catalysis Vol. 129; no. 1; pp. 7 - 16
Main Authors Dereven’kov, Ilia A., Makarov, Sergei V.
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 01.02.2020
Subjects
Catalysis
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Physical Chemistry
Tetrasulfonated cobalt phthalocyanine
Selenite
Selenium
Dithionite
Catalysis
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Summary:This works reports that tetrasulfonated cobalt(II) phthalocyanine (Co(II)TSPc) catalyzes reduction of selenite (SeO 3 2− ), the one of the most toxic form of selenium, to slightly toxic Se(0) by dithionite (S 2 O 4 2− ) 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.
ISSN:1878-5190
1878-5204
DOI:10.1007/s11144-019-01687-6