Summary
Very stable cation radicals of N, N, N′, N′-tetramethyl-p-phenylenediamine and N,N,N′,N′-tetramethylbenzidine were produced in poly(methyl methacrylate) matrix by the intense photoexcitation of pulsed UV lasers or by a focused Xenon lamp. The color of the ion radicals could be recognized even a year after the photoexcitation at room temperature, although the rate of fading was accelerated by raising the temperature to the glass-transition temperature of the polymer (ca. 120 °C). The light intensity dependence of the produced cation radicals proved the two-photonic nature of this photoionization.
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Tsuchida, A., Nakano, M., Yoshida, M. et al. Long-lived cation radical formation of aromatic amines in poly(methyl methacrylate) matrix at room temperature by two-photon excitation. Polymer Bulletin 20, 297–304 (1988). https://doi.org/10.1007/BF00261984
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DOI: https://doi.org/10.1007/BF00261984