Mathematical description of pH-stat kinetic traces measured during photochemical quinone decomposition?
Photochemical & Photobiological Sciences Pub Date: 2016-11-24 DOI: 10.1039/C6PP00333H
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.
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Journal Name：Photochemical & Photobiological Sciences
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CAS no.: 89640-58-4
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