Infrared Spectroscopy Tutorial
- Infrared (ir) spectroscopy is used to identify particular bond types and functional groups in organic molecules by measuring a substance's absorption of infrared radiation at different frequencies.
- Wavenumber is the number of wavelengths per centimetre (cm-1).
Organic groups show absorbance in the range ≈1000 to 3000 cm-1.
- Infrared (ir) spectra show a 'fingerprint' region between ≈1000 and 400 cm-1 which is specific to a particular compound.
The ir spectrum of an unknown compound can be compared to known spectra in order to identify the unknown compound.