Magnetic isotope effects in the photolysis of dibenzyl ketone on porous silica. /sup 13/C and /sup 17/O enrichments
Journal Article
·
· J. Phys. Chem.; (United States)
The photolysis of dibenzyl ketone (DBK) on porous silica has been investigated. Both /sup 13/C and /sup 17/O isotopic enrichment in the ketone remaining after partial photolysis is demonstrated. The efficiency of /sup 13/C enrichment was found to be relatively insensitive to the average pore diameter of the silica host, to the percent coverage by DBK, and to the application of an external magnetic field. A significant dependence of /sup 13/C enrichment with temperature, with a maximum in the enrichment-temperature profile, was observed. The results are interpreted in terms of the competition between pathways available to the triplet C/sub 6/H/sub 5/CH/sub 2/COCH/sub 2/C/sub 6/H/sub 5/ radical pair produced by photolysis of DBK.
- Research Organization:
- Columbia Univ., New York, NY
- OSTI ID:
- 5262960
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:9; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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Wed Jul 01 00:00:00 EDT 1981
· J. Am. Chem. Soc.; (United States)
·
OSTI ID:6205989
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Journal Article
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Thu Dec 31 23:00:00 EST 1987
· Dokl. Phys. Chem. (Engl. Transl.); (United States)
·
OSTI ID:6288593
Wavelength effects in the photolysis of ketones: Stereoisomerization and magnetic isotope [sup 13]C/[sup 12]C separation. A probe for adiabatic versus diabatic trajectories during bond dissociation
Journal Article
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Wed Jan 13 23:00:00 EST 1993
· Journal of Physical Chemistry; (United States)
·
OSTI ID:6389559
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400203* -- Isotope Exchange & Isotope Separation-- (-1987)
ARYL RADICALS
BENZYL RADICALS
CARBON 13
CARBON ISOTOPES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
ISOTOPE ENRICHED MATERIALS
ISOTOPE SEPARATION
ISOTOPES
KETONES
LIGHT NUCLEI
MAGNETIC FIELDS
MATERIALS
MEDIUM TEMPERATURE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN 17
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
400203* -- Isotope Exchange & Isotope Separation-- (-1987)
ARYL RADICALS
BENZYL RADICALS
CARBON 13
CARBON ISOTOPES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
ISOTOPE ENRICHED MATERIALS
ISOTOPE SEPARATION
ISOTOPES
KETONES
LIGHT NUCLEI
MAGNETIC FIELDS
MATERIALS
MEDIUM TEMPERATURE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN 17
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
TEMPERATURE DEPENDENCE