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

Virág Kiss, Gábor Lehoczki, K. Ősz

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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.

Original languageEnglish
Pages (from-to)519-526
Number of pages8
JournalPhotochemical and Photobiological Sciences
Volume16
Issue number4
DOIs
Publication statusPublished - Jan 1 2017

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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