Photo-induced charge separation in hydroxycoumarins on TiO2 and F–TiO2

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 48; no. 29; pp. 10881 - 10891
• Main Authors: Gao, Yunlong, Lockart, Molly, Kispert, Lowell D, Bowman, Michael K
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 07.08.2019
• Subjects: Charge efficiency; Conduction bands; Donors (electronic); Dyes; Electron transfer; Fluorine; Free radicals; Hydroxyl groups; Mathematical analysis; Separation; Titanium dioxide

The efficiency of photocatalytic charge separation is much higher for 7-hydroxycoumarin (7-CN) and 6,7-dihydroxycoumarin (6,7-CN) adsorbed on the surface modified TiO2 where the surface hydroxyl group was replaced by a fluorine atom (F–TiO2) than on TiO2. EPR measurements find 5- and 12-fold increas...