Coupling between hydrogen and fluorine (spin 1/2) is very strong. Typical 2J coupling constants are about 48 Hz. Longer range coupling is smaller. Typical 4J coupling constants are about 4 Hz.
The figure below contains the NMR spectrum for fluoroacetone. The nuclear spin of fluorine is 1/2. This means that the proton signal is split into n + 1 parts.
Figure. NMR spectrum of fluoroacetone.
Coupling between carbon and fluorine (spin 1/2) is very strong. Typical 1J coupling constants are about 185 Hz. Longer range coupling is smaller. Typical 2J coupling constants are about 20 Hz.
The figure below contains the NMR spectrum for fluoroacetone. The nuclear spin of fluorine is 1/2. This means that the carbon signals are split into n + 1 parts.
Figure. NMR spectrum of fluoroacetone.
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