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CHEM 262 - IR

Wavenumber values for common functional groups.

Functional GroupWavenumber
O-H 3500 cm^-1 (broad)
N-H 3300 cm^-1 (broad or sharp; one bump or two bumps)
C-H (aryl/vinyl groups) 3100 cm^-1
C-H (alkyl groups) 3000 cm^-1
C=O (acid chloride) 1800 cm^-1
C=O (ester) 1740 cm^-1
C=O (carboxylic acid) 1710 cm^-1 (broad O-H stretch @ 2500 cm^-1 - 3500 cm^-1)
C=O (ketone) 1710 cm^-1
C=O (aldehyde) 1710 cm^-1 (C-H stretch @ 2700 cm^-1 and 2800 cm^-1)
C=O (amide) 1650 cm^-1