Abstract
The magnetic field dependence of the 19F polarization observed in the reaction of tetrafluorobenzoquinone with tetrafluorohydroquinone in benzene has been studied. The results can be interpreted in terms of three different polarization mechanisms. The effects observed at fields below 100 G can be ascribed to a radical-pair mechanism involving S-T± mixing. At fields of 1–20 kG two different contributions have been identified which can be observed separately under appropriate experimental conditions. One contribution showing a maximum near 4 kG is assigned to a biradical adduct between the triplet quinone and the solvent, benzene. The other contribution shows a monotonical increase with magnetic field strength. This effect is assigned to the triplet-Overhauser mechanism in the reaction of the triplet quinone with the hydroquinone.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5878-5883 |
| Number of pages | 6 |
| Journal | Journal of the American Chemical Society |
| Volume | 104 |
| Issue number | 22 |
| DOIs | |
| State | Published - Jan 1 1982 |
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All Science Journal Classification (ASJC) codes
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry
Cite this
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Magnetic Field Dependence of 19F Nuclear Spin Polarization. The System Tetrafluorobenzoquinone-Tetrafluorohydroquinone. / Hutton, Richard S.; Roth, Heinz D.; Manion Schilling, Marcia L.; Trozzolo, Anthony M.; Leslie, Thomas M.
In: Journal of the American Chemical Society, Vol. 104, No. 22, 01.01.1982, p. 5878-5883.Research output: Contribution to journal › Article
TY - JOUR
T1 - Magnetic Field Dependence of 19F Nuclear Spin Polarization. The System Tetrafluorobenzoquinone-Tetrafluorohydroquinone
AU - Hutton, Richard S.
AU - Roth, Heinz D.
AU - Manion Schilling, Marcia L.
AU - Trozzolo, Anthony M.
AU - Leslie, Thomas M.
PY - 1982/1/1
Y1 - 1982/1/1
N2 - The magnetic field dependence of the 19F polarization observed in the reaction of tetrafluorobenzoquinone with tetrafluorohydroquinone in benzene has been studied. The results can be interpreted in terms of three different polarization mechanisms. The effects observed at fields below 100 G can be ascribed to a radical-pair mechanism involving S-T± mixing. At fields of 1–20 kG two different contributions have been identified which can be observed separately under appropriate experimental conditions. One contribution showing a maximum near 4 kG is assigned to a biradical adduct between the triplet quinone and the solvent, benzene. The other contribution shows a monotonical increase with magnetic field strength. This effect is assigned to the triplet-Overhauser mechanism in the reaction of the triplet quinone with the hydroquinone.
AB - The magnetic field dependence of the 19F polarization observed in the reaction of tetrafluorobenzoquinone with tetrafluorohydroquinone in benzene has been studied. The results can be interpreted in terms of three different polarization mechanisms. The effects observed at fields below 100 G can be ascribed to a radical-pair mechanism involving S-T± mixing. At fields of 1–20 kG two different contributions have been identified which can be observed separately under appropriate experimental conditions. One contribution showing a maximum near 4 kG is assigned to a biradical adduct between the triplet quinone and the solvent, benzene. The other contribution shows a monotonical increase with magnetic field strength. This effect is assigned to the triplet-Overhauser mechanism in the reaction of the triplet quinone with the hydroquinone.
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U2 - 10.1021/ja00386a005
DO - 10.1021/ja00386a005
M3 - Article
AN - SCOPUS:33845555185
VL - 104
SP - 5878
EP - 5883
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 22
ER -