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rule

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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