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

作者：Williams Sian L^*; Worrall David R; Kirkpatrick Iain; Vancea Anisoara; Pan Jiawei

来源：Photochemical and Photobiological Sciences, 2011, 10(1): 84-90.

DOI：10.1039/c0pp00256a

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 degrees 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.

• 出版日期2011