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CHEM 262 - IR
Wavenumber values for common functional groups.
Functional Group | Wavenumber |
---|---|
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 |