Transients generated upon photolysis of colloidal titanium dioxide in acetonitrile containing organic redox couples

Photoinduced electron transfer reaction of few selected organic systems in presence of titanium dioxide

“…Such heterogeneous photocatalysis has been carried out both in organic solvents (usually acetonitrile) [11][12][13][14][15][16][17][18] and in aqueous suspensions [19][20][21][22][23][24][25][26] and also in acetonitrile/water mixture [27].…”

Photocatalyzed reaction of indole in an aqueous suspension of titanium dioxide

“…The reaction of this electron-hole pair with a variety of electron acceptors and donors, and the electron-hole recombination processes, have been well studied [7,8]. The formation of cation radicals of organic substrates, following electron transfer to the excited semiconductor has been unambiguously characterized both from product analysis [9] and by spectroscopic studies [10]. The trapped hole in TiO 2 can lead to the formation of hydroxyl radicals, which can abstract a hydrogen atom from weak C-H bonds and reacts with multiple bonds, including reactions with aromatic systems, leading to the formation of free radicals.…”

Heterogeneous photocatalyzed degradation of uracil and 5-bromouracil in aqueous suspensions of titanium dioxide

“…The reaction of this electron-hole pair with a variety of electron acceptors and donors, as well as the electron-hole recombination processes has been well studied [7,8]. The formation of cation radicals of organic substrates, following an electron transfer from it to the excited semiconductor has been unambiguously characterized, both from product analysis [9] as well as by spectroscopic studies [10]. The trapped hole in TiO 2 can lead to the formation of hydroxyl radicals, which can abstract a hydrogen atom from weak C-H bonds and reacts with multiple bonds, including reactions with aromatic systems, leading to the formation of free radicals.…”