Photoreactivity of WO/sub 3/ dispersions: spin trapping and electron spin resonance detection of radical intermediates
Spin-trapping techniques were used to detect free radical intermediates formed upon irradiation of WO/sub 3/ powders dispersed in a mixture of water and alcohol (methanol, ethanol, 1-propanol, or 2-propanol). Three spin traps were used: two nitrones, ..cap alpha..-(1-oxo-4-pyridyl)-N-tert-butylnitrone (POBN) and 5,5-dimethyl-1-pyrroline N-oxide (DMPO), and one nitroso, 2-methyl-2-nitrosopropane (NtB). Hydroxyl and hydroxyalkyl adducts were unambiguously identified. They arise from the photooxidation of the solvent. During the irradiation, the tungsten oxide was reduced. Experiments performed with WO/sub 3/ aqueous dispersions containing various amounts of ethanol suggest that ethanol should be very sensitive toward oxidation by the photogenerated holes. Nevertheless, water seems to play a key role in the oxidation process.
- Research Organization:
- Universite Paris VI, France
- OSTI ID:
- 5457407
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:17; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALCOHOLS
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DISPERSIONS
ELECTRON SPIN RESONANCE
ETHANOL
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
MAGNETIC RESONANCE
METHANOL
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PROPANOLS
REACTION INTERMEDIATES
REFRACTORY METAL COMPOUNDS
RESONANCE
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES