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IR Frequencies

Infrared spectroscopy frequencies

Questioncm -1
Alkane sp3 C-H stretch 2950
Alkene sp2 C-H stretch 3050
C=C stretch 1600 (often weak)
Alkynes sp C-H stretch 3300
C-tb-C stretch 2200
Alcohols O-H stretch 3440 (usually big and broad)
C-O stretch 1150
Ketones C=O stretch 1710
Aldehydes C=O stretch 1710
Aldehydes C-H stretch 2800
Esters C=O stretch 1735
Esters C-O stretch 1150
Carboxylic acids C=O stretch 1710
Carboxylic acids O-H stretch 3400 to 2800 (usually VERY big and broad)
N-H stretch 3400
1* amine (-NH2) two peaks
2* amine one peak
3* amine no peak
C-N stretch about like C-O stretch
Amides C=O 1810
Acid Anhydrides two C=O stretches 1820, 1760
Benzene Rings C-C ring bonds 1450
Aromatic C-H out-of-plane bonding 750
C-tb-N stretch 2200
Created by: reynoldsbn