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IR Stretches

Organic CHemistry II IR Stretches, Important ones and functional groups

Range (cm-1)Group/Structure and Signal
3600-3400 OH Stretch (broad)
3600 Dilute Alcohol (strong)
3500-3250 Non-Dilute Alcohol (strong)
3600-2000 Acids (strong, very broad)
3400-3200 N-H Stretch (medium, moderatly broad)
3000-2800 sp3 C-H, C-H2, C-H3 (strong)
3100-3000 sp2 C-H Stretch (strong)
3200-3100 sp C-H Stretch (strong, sharp)
2300-2100 C-triple-N (medium, sharp)
~2100 C-triple-C Stretch (weak, sharp)
1650-1600 C=C Stretch (Alkenes and Aromatics) (medium)
1660-1620 C=N Stretch (medium) C=O Stretch (strong)
1820-1800 Alkyl Chloride (strong)
1760-1735 Ester (strong)
1740-1710 Carboxylic Acid (strong)
1780-1750 1820-1800 Anhydride Symmetrical 1780-1750 Asymmetrical 1820-1800 (strong)
1690-1660 NHR, NH2, NR2 Amide (strong)
1710-1690 Ketone (strong)
1770-1710 Aldehyde (strong)
Created by: 100000394121773