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4. Signal intensities

Next to the number of signals in an NMR spectrum and their chemical shifts, additional information about the compound in question can also be derived from the intensities of the signals.

Please repeat:
  1. The intensity is measured as the below the resonance signal. To determine the area, the spectrum is integrated automatically, and the cummulative integral is plotted on the spectrum.
  2. The intensities are proportional to the , that contribute to the signal.

As an example serves the spectrum of :

Above the spectrum the integral is plotted in red. The magnitude of the steps in this curve is a direct representation of the number of protons that contribute to each signal.

Assign the the protons in the molecule based on the integrals of the signals (I) through (IV)

If you need some extra help, check on page 54!
If you want to compare your answer to the correct one, continue to page 59