BRAINCAKEThe n+1 Rule
The number of sub-peaks in a split 1H NMR peak is given by the n+1 rule:
number of sub-peaks = n + 1
where n is the number of protons on the adjacent carbon atom(s). Do not count the protons in the environment itself, or O-H protons, which usually do not cause splitting.
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
Key terms in this lesson
- doublet
- An NMR peak split into two sub-peaks in a 1:1 ratio, caused by one proton on an adjacent carbon atom.
- triplet
- An NMR peak split into three sub-peaks in a 1:2:1 ratio, caused by two protons on adjacent carbon atoms.
More in NMR Spectroscopy
- Deuterated Solvents
- 13C NMR Spectroscopy
- Interpreting 13C NMR Spectra
- 1H NMR Spectroscopy
- Relative Peak Areas
- Spin-Spin Splitting
- Identifying O-H and N-H Protons with D2O
- Combining Techniques to Deduce Structures
All 12 lessons in NMR Spectroscopy · All OCR A-level Organic Chemistry topics