Infrared Absorption Bands


IR absorption spectroscopy uses mid-infrared light (2.5 - 50 Ám, 4000 - 200 cm-1) to detect specific types of chemical bonds in a sample for identification of organic and organometallic molecules.

Table of characteristic IR bands

Group    Bond    Appox. Energy (cm-1)
hydroxyl O-H 3610-3640
amines N-H 3300-3500
aromatic rings C-H 3000-3100
alkenes C-H 3020-3080
alkanes C-H 2850-2960
nitriles C=-N 2210-2260
carbonyl C=O 1650-1750
amines C-N 1180-1360

Further Information

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Copyright © 1996 by Brian M. Tissue

updated 2/24/96