Activation energies of photoinduced unimolecular, bimolecular and termolecular processes on silica gel surfaces
journal contributionposted on 28.10.2014 by Sian L. Williams, David Worrall, Iain Kirkpatrick, Anisoara Vancea, Jiawei Pan
Any type of content formally published in an academic journal, usually following a peer-review process.
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.
The authors would like to thank EPSRC for funding this project