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8
CH1012
COUPLING
1H
1H or proton NMR
signals
are often complex signals
are often complex signals
13C
• 13C NMR
signals are
observed as sharp
singlets under normal operating conditions.
(coupling to bonded
H spins is removed)
observed as sharp
singlets under normal operating conditions.
(coupling to bonded
H spins is removed)
Natural abundance 13C
of 1.1% means a very
low prob. of adjacent 13C-13C \ no coupling.
of 1.1% means a very
low prob. of adjacent 13C-13C \ no coupling.
We use proton decoupling to remove J 1H13C
• Coupling of
adjacent
H spins gives these
complex patterns.
H spins gives these
complex patterns.
