This technique can be provide multiplets information (about the attached protons) while keeping the spectrum relatively simple in appearance.
In an off resonance decoupled 13C spectrum the coupling between each carbon atom and each hydrogen attached directly to it is observed. However the apparent magnitude of the coupling constant is reduced, the overlap of the resulting multiplets is a less frequent problem.
The off resonance decoupled spectrum retains the couplings between the carbon atom and directly attached proton but effectively remove the couplings between the carbon and more remote protons.
In this technique, the frequency of a second radio frequency transmitter (the decoupler) is set either up field or down field from the usual sweep width of a normal proton spectrum (off resonance). In contrast, in a true decoupling experiment the frequency of the decoupler is set 10-1 coincide exactly with the range of proton resonances.
Furthermore in off resonance decoupling, the power of the decoupling oscillator is held low to avoid complete decoupling.
In an off resonance decoupled 13C spectrum the coupling between each carbon atom and each hydrogen attached directly to it is observed. However the apparent magnitude of the coupling constant is reduced, the overlap of the resulting multiplets is a less frequent problem.
The off resonance decoupled spectrum retains the couplings between the carbon atom and directly attached proton but effectively remove the couplings between the carbon and more remote protons.
In this technique, the frequency of a second radio frequency transmitter (the decoupler) is set either up field or down field from the usual sweep width of a normal proton spectrum (off resonance). In contrast, in a true decoupling experiment the frequency of the decoupler is set 10-1 coincide exactly with the range of proton resonances.
Furthermore in off resonance decoupling, the power of the decoupling oscillator is held low to avoid complete decoupling.
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