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Mathematical description of pH-stat kinetic traces measured during photochemical quinone decomposition

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Abstract

Substituted 1,4-benzoquinone (QR) derivatives are photosensitive in aqueous solution and form hydroquinones (QR-H2) and hydroxy-quinones (QR-OH), two weak acids in their photoreaction. For this reason, the kinetics of the photoreaction can be conveniently followed by the pH-stat titration technique. The mathematical description of the kinetic traces measured provides the two main parameters of the photoreaction: the differential quantum yield of the reaction (Φ) and the ratio of the two photo-products, i.e. the fraction of QR that is converted to QR-OH (α). These values are described in this paper for 2,5-dichloro-1,4-benzoquinone at different pH values, together with the detailed mathematical evaluation of the application limits of the pH-stat method for such reactions.

Graphical abstract: Mathematical description of pH-stat kinetic traces measured during photochemical quinone decomposition

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Publication details

The article was received on 08 Sep 2016, accepted on 23 Nov 2016, published on 24 Nov 2016 and first published online on 24 Nov 2016


Article type: Paper
DOI: 10.1039/C6PP00333H
Citation: Photochem. Photobiol. Sci., 2017, Advance Article
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    Mathematical description of pH-stat kinetic traces measured during photochemical quinone decomposition

    V. Kiss, G. Lehoczki and K. Ősz, Photochem. Photobiol. Sci., 2017, Advance Article , DOI: 10.1039/C6PP00333H

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