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IR Band Positions

Characteristic IR Band Positions

Group	Frequency Range (cm^-1)
OH stretching vibrations
Free OH	3610-3645 (sharp)
Intramolecular H bonds	3450-3600 (sharp)
Intermolecular H Bonds	3200-3550 (broad)
Chelate Compounds	2500-3200 (very broad)
NH Stretching vibrations
Free NH	3300-3500
H bonded NH	3070-3350
CH Stretching vibrations
=-C-H	3280-3340
=C-H	3000-3100
C-CH3	2862-2882, 2652-2972
O-CH3	2815-2832
N-CH3 (aromatic)	2810-2820
N-CH3 (aliphatic)	2780-2805
CH2	2843-2863,2916-2936
CH	2880-2900
SH Stretching Vibrations
Free SH	2550-2600
C=-N Stretching Vibrations
Nonconjugated	2240-2260
Conjugated	2215-2240
C=-C Stretching Vibrations
C=-CH (terminal)	2100-2140
C-C=-C-C	2190-2260
C-C=-C-C=-CH	2040-2200
C=O Stretching Vibrations
Nonconjugated	1700-1900
Conjugated	1590-1750
Amides	~1650
C=C Sretching Vibrations
Nonconjugated	1620-1680
Conjugated	1585-1625
CH Bending Vibrations
CH2	1405-1465
CH3	1355-1395, 1430-1470
C-O-C Vibrations in Esters
Formates	~1175
Acetates	~1240, 1010-1040
Benzoates	~1275
C-OH Stretching Vibrations
Secondary Cyclic Alcohols	990-1060
CH out-of-plane bending vibrations in substituted ethylenic systems
-CH=CH2	905-915, 985-995
-CH=CH-(cis)	650-750
-CH=CH-(trans)	960-970
C=CH2	885-895

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