Detailed Correlation Chart for IR Spectroscopy
By Levi Clancy for Student Reader on
updated
| C-H | Alkanes | (stretch) | 3000-2850 | s |
| -CH3 | (bend) | 1450 & 1375 | m | |
| -CH2- | (bend) | 1465 | m | |
| Alkenes | (stretch) | 3100-3000 | m | |
| Alkenes | (out-of-plane bend) | 1000-650 | s | |
| Aromatics | (stretch) | 3150-3050 | s | |
| (out-of-plane bend) | 900-690 | s | ||
| Alkyne | (stretch) | ca. 3300 | s | |
| Aldehyde | 2900-2800 | w | ||
| 2800-2700 | w | |||
| C-C | Alkane | Not useful | ||
| C=C | Alkene | 1680-1600 | m-w | |
| Aromatic | 1600 & 1475 | m-w | ||
| C≡C | Alkyne | 2250-2100 | m-w | |
| C=O | Aldehyde | 1740-1720 | s | |
| Ketone | 1725-1705 | s | ||
| Carboxylic Acid | 1725-1700 | s | ||
| Ester | 1750-1730 | s | ||
| Amide | 1680-1630 | s | ||
| Ahydride | 1810 & 1760 | s | ||
| Acid Chloride | 1800 | s | ||
| C-O | Alcohol, ether, ester, carboxylic acid, anhydride | 1300-1000 | s | |
| O-H | Alcohols, phenols | |||
| Free | 3650-3600 | m | ||
| H-bonded | 3400-3200 | s | ||
| Carboxylic Acids | 3400-2400 | m | ||
| N-H | 1º & 2º Amines & Amides | |||
| (stretch) | 3500-3100 | m | ||
| (bend) | 1640-1550 | m-s | ||
| C-N | Amines | 1350-1000 | m-s | |
| C=N | Imines & Oximes | 1690-1640 | w-s | |
| C≡N | Nitriles | 2260-2240 | m | |
| X=C=Y | Allenes, Ketenes, | Isocyanates, Isothiocyanates | 2270-1940 | m-s |
| N=O | Nitro (R-NO2 | 1550 & 1350 | s | |
| S-H | Mercaptans | 2550 | w | |
| S=O | Sulfoxides | 1050 | s | |
| Sulfones, Sulfonyl | Chlorides, Sulfates, Sulfonamides | 1375-1300 & 1350-1140 | s | |
| C-X | Fluoride | 1400-1000 | s | |
| Chloride | 785-540 | s | ||
| Bromide, Iodide | <667 | s | ||