Green photocatalytic organic transformations by polyoxometalates vs. mesoporous TiO2 nanoparticles: selective aerobic oxidation of alcohols

2015 ◽  
Vol 14 (3) ◽  
pp. 563-568 ◽  
Author(s):  
Theodoros S. Symeonidis ◽  
Ioannis Tamiolakis ◽  
Gerasimos S. Armatas ◽  
Ioannis N. Lykakis
Keyword(s):  
Electron Transfer ◽  
Tio2 Nanoparticles ◽  
Aerobic Oxidation ◽  
Mesoporous Tio2 ◽  
Transfer Mechanism ◽  
Organic Transformations ◽  
Electron Transfer Mechanism ◽  
Nanoparticle Assemblies ◽  
Oxidation Of Alcohols ◽  
Aromatic Alcohols

Decatungstate supported on mesoporous TiO2 nanoparticle assemblies catalyze the selective and efficient oxidation of aromatic alcohols under “green” oxidation conditions. An electron transfer mechanism was predominated under UV-vis irradiation.

Surface photochemistry: Semiconductor mediated reactions of some 1,2-diarylcyclopropanes

1987 ◽  
Vol 65 (5) ◽  
pp. 976-979 ◽  
Author(s):  
Philip A. Carson ◽  
Paul de Mayo
Keyword(s):  
Electron Transfer ◽  
Radical Cations ◽  
Transfer Mechanism ◽  
Electron Transfer Mechanism ◽  
Trans Isomerization

1,2-Diphenylcyclopropane (1) was found to be oxidized on illuminated ZnO in the presence of air while 1-(p-methoxyphenyl)-2-phenylcyclopropane (2) and 1,2-bis(p-methoxyphenyl)cyclopropane (3) were found to be similarly oxidized on illuminated CdS. Compounds 2 and 3 were found, also, to undergo a rapid photochemical cis-trans isomerization on CdS whereas 1 did not undergo such isomerization. An electron transfer mechanism involving formation of the radical cations of the substrates is proposed.

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