Protons on a carbon atom can feel the effects of other protons on adjacent carbon atoms. The signal for a particular proton will be split by protons on adjacent carbons into n+1 peaks (n being the number of adjacent protons). Figure 12 shows the splitting for chloroethane.
Figure 12. Spin-spin splitting in chloroethane.
Figure 13 shows the NMR spectrum for chloroethane. Notice that there are two signals (for the two different types of protons) each split according to the number of adjacent protons.
Figure 13. NMR spectrum for chloroethane.
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