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IR Frequencies

Ir Frequencies

StructureIR Value
C=C 1660
C=-C <2200
aromatic C=C 1600
isolated C=C 1640-1680
conjugated C=C 1620-1640
sp3 C-H <3000
sp2 C-H >3000
sp C-H 3300 sharp
OH 3300 broad
2 NH (R2NH) 3300 broad 1 spike
1 NH (RNH2) 3300 broad 2 spikes
C=O 1710
carboxylic 1710 & 3300 OH
aldehyde 1710 & 2700 & 2800
ketone 1710
ester C=O 1735
C=N 1660
C=-N >2200
Created by: Gianna B
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