Quantitative analysis of the dynamic behaviour of photochromic systems |
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Authors: | Stéphanie Delbaere Gaston Vermeersch Jean-Claude Micheau[Author vitae] |
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Institution: | aUniversity Lille Nord de France, UDSL, CNRS UMR 8516, F-59006 Lille Cedex, France;bCNRS UMR 5623, IMRCP, University Toulouse III, Paul Sabatier, F-31062 Toulouse Cedex, France |
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Abstract: | The good understanding of a photochromic reaction mechanism requires the establishment of the list of all the transient species and the definition of their connecting processes. The purpose of kinetic studies is the determination of the main photochromic parameters, such as the quantum yields of photoisomerization, rate constants of thermal relaxation and spectra of transient species. These data allow the establishment of structure properties relationships in order to select the best substituents to improve photochromic performances within a given series. In this review, we describe the dynamic behaviour of various photochromic systems during thermal relaxation after irradiation, from the simplest mono-exponential decay to the more complicated multi-exponential dynamics. Then, we analyse the evolution of the long-lived isomers under continuous irradiation. Several pedagogical examples and tricks to perform easy kinetic analysis are given in the appendices. |
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Keywords: | Photochromism Kinetic analysis Multi-species systems Multi-processes Photochemical processes Thermal relaxation |
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