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Along with classical UV-Visible spectroscopy allowing for the determination of intrinsic properties(λmax,ε), multinuclear NMR spectroscopy is a promising and useful tool for studying photochromicreactions. UV irradiation of the initial structure leads to the formation of photoproducts, which can be structurallyidentified by 1D and 2D NMR experiments. The kinetics of thermal back reaction are monitored bydirectly and separately measuring the concentrations of each long-living species at regular time intervalsin NMR spectra. A plausible reaction mechanism can therefore be proposed. Based on this mechanism, thekinetic analysis and the study of the effects of temperature lead to the determination of the kinetic andthermodynamic parameters (rate coefficients, enthalpy and entropy of activation) of the photochromic systemunder investigation. This process has been applied to several photochromic families, spirooxazines andbenzo- and naphtho-pyrans

Contribution of NMR spectroscopy to the mechanistic understanding of photochromism