Strong Coupling in Nuclear Resonance Spectra. I. The Five-Spin System of trans-Propenylbenzene

Publisher Website
Google Scholar
Abstract
Energy levels and allowed transitions are calculated for a system of five spin‐½ particles of the type ABX3. An extension to the more general system ABC3 is made by perturbation theory. The results are applied to an analysis of the proton resonance spectrum of trans‐propenylbenzene, and it is found that at least one spin‐spin coupling constant is negative. An ``anomalous'' spectrum previously reported, which shows superficial resemblances to the one studied here, is explained by assuming the presence of an impurity.