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Activation energies of photoinduced unimolecular, bimolecular and termolecular processes on silica gel surfaces

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Abstract

Activation energies for energy and electron transfer have been measured in various systems on silica gel. In the case of ion-electron recombination, a facile technique involving fluorescence recovery is described which complements diffuse reflectance spectroscopy in the study of these systems. In bimolecular anthracene/azulene systems, activation energies have been shown to be independent of pre-treatment temperature in the range 25–210 °C, demonstrating that physisorbed water plays little role in determining diffusion rates on silica gel. In a ternary anthracene/azulene/perylene system, we have for the first time presented comparative activation energies for the diffusion of azulene and its radical cation, and have shown a greater activation energy for diffusion of the latter species.

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Authors and Affiliations

  1. Department of Chemistry, Loughborough University, Loughborough, Leicestershire, UK, LE11 3TU

    Siân L. Williams, David R. Worrall, Iain Kirkpatrick, Anisoara Vancea & Jiawei Pan

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  1. Siân L. Williams
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  2. David R. Worrall
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Williams, S.L., Worrall, D.R., Kirkpatrick, I. et al. Activation energies of photoinduced unimolecular, bimolecular and termolecular processes on silica gel surfaces. Photochem Photobiol Sci 10, 84–90 (2011). https://doi.org/10.1039/c0pp00256a

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