Chemically Induced Dynamic Nuclear Polarization in the Photochemical Reaction of Phenanthraquinone with Hydrogen Donors. I. Kinetics of Nuclear Spin Polarization
- 1 October 1971
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 44 (10) , 2756-2760
- https://doi.org/10.1246/bcsj.44.2756
Abstract
Strongly-enhanced NMR signals were observed in the photo-induced hydrogen abstraction reaction of phenanthraquinone with several hydrogen donors in benzene. Chemically-induced dynamic nuclear polarization was kinetically treated in the photochemical reaction during the course of irradiation by visible light and shut-off. It was found that the relaxation time of the nuclear-spin system under the irradiation is shorter by a factor of 2 to 4 than that in the black-out stage and that the enhancement factor for the methine proton of the 1,2-adduct of phenanthraquinone was evaluated as 1000–2000.Keywords
This publication has 18 references indexed in Scilit:
- Theory of chemically induced nuclear spin polarization. III. Effect of isotropic g shifts in the components of radical pairs with one hyperfine interactionJournal of the American Chemical Society, 1970
- Photochemistry of methyl diazoacetate in chloro-substituted methanes. Evidence for a chain mechanism from nuclear polarization studiesJournal of the American Chemical Society, 1970
- Theory of chemically induced nuclear spin polarization. IV. Spectra of radical coupling products derived from photoexcited ketones and aldehydesJournal of the American Chemical Society, 1970
- Induced dynamic nuclear spin polarization in photoreductions of benzophenone by toluene and ethylbenzeneJournal of the American Chemical Society, 1969
- Chemically induced nuclear spin polarization as a tool for determination of spin multiplicities of radical-pair precursorsJournal of the American Chemical Society, 1969
- Reaction dynamics in nuclear polarizationJournal of the American Chemical Society, 1969
- Free radical iodide-lithium interchangeJournal of the American Chemical Society, 1969
- Chemically induced dynamic nuclear polarization evidence for one-electron transfers during some halogen-metal exchange reactionsJournal of the American Chemical Society, 1969
- Chemically induced dynamic nuclear polarizationJournal of the American Chemical Society, 1967
- Nuclear magnetic resonance emission and enhanced absorption in rapid organometallic reactionsJournal of the American Chemical Society, 1967