Infrared Spectroscopy and Mass Spectrometry

  • Created by: ava.scott
  • Created on: 25-05-14 16:47


Molecules absorb infrared radiation by vibrating. The amount of vibration depends on

  • bond strength
  • bond length
  • mass of atoms within bond

Infrared spectrum shows functional groups of substances. Each peak represents the absorbsance of infrared radiation energy of a particular bond in the molecule.

Look out for:

  • Aldehydes have C=O bonds (1640=1750) made through DISTILLATION of primary alcohols
  • Ketones also have C=O bonds and are made by REFLUX of secondary alcohols
  • Esters have C=O bonds, C-O bonds (1000 to 1300).
  • Carboxylic acids have the C=O and C-O and O-H bonds and are made from oxidation of aldehydes.
  • MOST have peak at 3000 showing a C-H bond (not broad so…


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