ENDOR of perylene radicals adsorbed on alumina and silica-alumina powders II. The matrix effects
- Univ. of Illinois, Urbana (USA)
Nuclei in the environment (matrix) of perylene cation radicals formed on activated alumina and silica-alumina powders exposed to solutions of perylene in benzene solvent were probed with electron nuclear double-resonance (ENDOR) spectroscopy. Both normal and fully deuterated perylene and benzene were studied. Depending on the nature of the sample and experimental conditions, signals were detected from protons, deuterons, and aluminum-27 in the environment of the radical. A strong proton matrix signal was observed in spectra of alumina-adsorbed radicals in all preparations, indicating the presence of protons on the surface. In contrast, spectra of radicals adsorbed on silica-alumina exhibited much weaker proton matrix signals under all conditions. A deuterium matrix signal was observed with both alumina and silica-alumina surfaces (although weakly on the latter) when deuterated solvent was present. Aluminum-27 signals were seen only from samples on the alumina surface. Active site models consistent with the results are discussed. The results suggest that the radicals, although themselves similar, occupy sites of significantly different environment. 23 refs.
- DOE Contract Number:
- FG22-84PC70782
- OSTI ID:
- 6902268
- Journal Information:
- Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 115:2; ISSN JCTLA; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM 27
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
ALUMINIUM OXIDES
AROMATICS
BENZENE
CHALCOGENIDES
CONDENSED AROMATICS
CRYSTAL STRUCTURE
DEUTERIUM
ENDOR
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MICROSTRUCTURE
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERYLENE
RADICALS
RESONANCE
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
STABLE ISOTOPES
SURFACE PROPERTIES