Oxygen uptake and involvement of superoxide radicals upon photolysis of ketones in air-saturated aqueous alcohol, formate, amine or ascorbic acid solutions

Photochemistry and Photobiology
Helmut Görner

Abstract

The photolysis of acetophenone, benzophenone, 4-carboxybenzophenone and benzil was studied in air-saturated aqueous solution in the presence of alcohols. The overall reaction is an oxidation of 2-propanol to acetone. The quantum yield of oxygen uptake (Phi(-O(2))) increases with increasing 2-propanol concentration up to 0.9. The photoreaction can also be initiated by quenching of the ketone triplet state by ascorbic acid, formate or an amine e.g. triethylamine. Subsequent reactions of the involved radicals with oxygen yield the superoxide radical and eventually hydrogen peroxide. For the ketones in the presence of 3-30 mM ascorbic acid or triethylamine Phi(-O(2)) = 0.3-0.9. The specific properties of ketones, including 4-methoxyacetophenone and 2-acetonaphthone, the radicals involved and the pH and concentration dependences of Phi(-O(2)) are discussed.

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Citations

Oct 3, 2013·Environmental Science & Technology·Jannis WenkSilvio Canonica
May 28, 2016·The Journal of Physical Chemistry. a·PaviElle LockhartG Mills
Aug 29, 2013·The Journal of Physical Chemistry. a·Attila DemeterGyörgy Lendvay
May 10, 2013·The Journal of Physical Chemistry. a·Brian K LittleG Mills
Nov 2, 2006·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Helmut Görner
Jan 18, 2008·The Journal of Physical Chemistry. a·Helmut Görner
Jan 7, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Marc H SchneiderPatrick Tabeling
May 11, 2017·The Journal of Physical Chemistry. a·J R BlackG Mills
Aug 31, 2018·The Journal of Physical Chemistry. a·M S IslamG Mills

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