Detailed Correlation Chart for IR Spectroscopy

By Levi Clancy for Student Reader on
updated

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C-HAlkanes(stretch)3000-2850s
-CH3(bend)1450 & 1375m
-CH2-(bend)1465m
Alkenes(stretch)3100-3000m
Alkenes(out-of-plane bend)1000-650s
Aromatics(stretch)3150-3050s
(out-of-plane bend)900-690s
Alkyne(stretch)ca. 3300s
Aldehyde2900-2800w
2800-2700w
C-CAlkaneNot useful
C=CAlkene1680-1600m-w
Aromatic1600 & 1475m-w
C≡CAlkyne2250-2100m-w
C=OAldehyde1740-1720s
Ketone1725-1705s
Carboxylic Acid1725-1700s
Ester1750-1730s
Amide1680-1630s
Ahydride1810 & 1760s
Acid Chloride1800s
C-OAlcohol, ether, ester, carboxylic acid, anhydride1300-1000s
O-HAlcohols, phenols
Free3650-3600m
H-bonded3400-3200s
Carboxylic Acids3400-2400m
N-H1º & 2º Amines & Amides
(stretch)3500-3100m
(bend)1640-1550m-s
C-NAmines1350-1000m-s
C=NImines & Oximes1690-1640w-s
C≡NNitriles2260-2240m
X=C=YAllenes, Ketenes,Isocyanates, Isothiocyanates2270-1940m-s
N=ONitro (R-NO21550 & 1350s
S-HMercaptans2550w
S=OSulfoxides1050s
Sulfones, SulfonylChlorides, Sulfates, Sulfonamides1375-1300 & 1350-1140s
C-XFluoride1400-1000s
Chloride785-540s
Bromide, Iodide<667s