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Issue 43, 2015
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Oxidative photoreactivity of mono-transition-metal functionalized lacunary Keggin anions

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Abstract

A comparative study investigating the effects of metal substitution on the photocatalytic activity of metal oxide cluster anions is presented. The study shows that metal functionalization can be used to alter the photochemical properties of monolacunary tungstate – based Keggin clusters (α-[TM(H2O)SiW11O39]n (M = Co2+, Cu2+, Ni2+, Mn2+)). It is demonstrated that the photoactivity for the photooxidation of the model pollutant basic blue 41 is dependent of the type of metal employed and increases in the order Co < Cu < Ni < Mn under aerobic conditions and 390 nm monochromatic irradiation. A significant increase of the reaction rate is observed under aerated conditions compared with de-aerated conditions, suggesting that oxygen serves as a re-oxidant for the reduced clusters. Radical scavenging experiments suggest that the photocatalysis proceeds via formation of hydroxyl radicals.

Graphical abstract: Oxidative photoreactivity of mono-transition-metal functionalized lacunary Keggin anions

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Publication details

The article was received on 13 Aug 2015, accepted on 07 Oct 2015 and first published on 09 Oct 2015


Article type: Paper
DOI: 10.1039/C5DT03134F
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2015,44, 18919-18922
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    Oxidative photoreactivity of mono-transition-metal functionalized lacunary Keggin anions

    M. Dave and C. Streb, Dalton Trans., 2015, 44, 18919
    DOI: 10.1039/C5DT03134F

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