IR Spectroscopy by Functional Group
Amines N-H stretch 3500-3350 cm-1 C-N stretch (often weak and hard to find) 1250-1020 cm-1 (aliphatic) 1342-1266 cm-1 (aromatic) Aldehydes C-H stretch of -CHO 2830-2695 cm-1 C=O stretch 1740-1720 cm-1 Ketones C=O stretch 1750-1710 cm-1 (1715 is typical for aliphatic ketones) 1685-1665 cm-1 (conjugated) Carboxylic acids O-H of –CO2H 3600-2500 cm
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