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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) |