Infrared (IR) Spectroscopy

Infrared (IR) Spectroscopy

1. IR Spectroscopy involves interaction between a molecule and energy in the infrared region of the electromagnetic spectrum (4000 cm-1 to 400 cm-1) due to vibrations of their covalent bonds

2. The simplest types of vibration are bending and stretching vibrations, but the energy at which a bond absorbs radiation depends on a number of factors - such as the mass of bonded atoms; whether the bond is a single, double or triple bond; the type of vibration (bend or stretch)

3. Characteristic ranges for infrared absorption of different functional groups are given in the table following

4. When studying an infrared spectrum, it is important to note the bonds that are present as well as those that are absent (e.g. the lack of a carbonyl group or the lack of an -OH group)

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