Relative Signs of Nuclear Spin Coupling Constants: A Refinement of the Double-Irradiation Experiment

The application of a very weak perturbing radio-frequency field in nuclear magnetic double-resonance experiments in such a way as to irradiate just a single resonance transition is shown to give information about the relative signs of the spin coupling constants in systems of three or more spins. Th...

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Bibliographic Details
Published in:The Journal of chemical physics 1963-03, Vol.38 (5), p.1088-1093
Main Authors: Freeman, R., Bhacca, N. S.
Format: Article
Language:English
Subjects:
BROMINATED HYDROCARBONS
ELECTROMAGNETIC FIELDS
INTERACTIONS
IRRADIATION
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORGANIC BROMINE COMPOUNDS
PHYSICS
PROPANE
QUANTITATIVE ANALYSIS
RADIO WAVES
SPECTRA
SPIN
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Summary:The application of a very weak perturbing radio-frequency field in nuclear magnetic double-resonance experiments in such a way as to irradiate just a single resonance transition is shown to give information about the relative signs of the spin coupling constants in systems of three or more spins. The method is not restricted to near first-order spectra and may be used even when several multiplets overlap. It has been applied to the determination of the relative signs of the couplings in 1,2-dibromopropane, and the results agree with those of Finegold, who used conventional analysis methods. The sign of a long-range coupling is reported.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1733807