![]() ![]() ![]() The source of signal splitting is a phenomenon called spin-spin coupling, a term that describes the magnetic interactions between neighboring, non-equivalent NMR-active nuclei. The \(H_b\) signal at 5.76 ppm, on the other hand, is split into three sub-peaks, with the middle peak higher than the two outside peaks - if we were to integrate each subpeak, we would see that the area under the middle peak is twice that of each of the outside peaks. The signal at 3.96 ppm, corresponding to the two \(H_a\) protons, is split into two subpeaks of equal height (and area) – this is referred to as a doublet. In this and in many spectra to follow, we show enlargements of individual signals so that the signal splitting patterns are recognizable. Rather than being a complication, however, this splitting behavior is actually very useful because it provides us with more information about our sample molecule.Ĭonsider the spectrum for 1,1,2-trichloroethane. In fact, the \(^1H\)-NMR spectra of most organic molecules contain proton signals that are 'split' into two or more sub-peaks. The \(^1H\)-NMR spectra that we have seen so far (of methyl acetate and 1,4-dimethylbenzene) are somewhat unusual in the sense that in both of these molecules, each set of protons generates a single NMR signal. ![]()
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