Group Bond Frequency Range (cm-1 ) Alkyl C-H 2853-2962 Alcohol O-H 3590-3650 Amine N-H 3300-3500 Double bond Triple bond 1620-1680 2100-2260 Intensity Alkenyl C H H 3010-3095 (不 饱 和 氢 ） (饱 和 氢 ） Alkynyl H 3300 （ 炔 基 末 端 氢 ） Aromatic Ar-H - 3030 Monosubstituted 单 取 代 苯 690-710, 730-770 two peaks (Strong) o-Disubstituted 邻 -二 取 代 苯 735-770 one peak (Strong) m-Disubstituted 间 -二 取 代 苯 680-725, 750-810 two peaks (Strong) p-Disubstituted 对 -二 取 代 苯 800-840 one peaks (Strong) (medium-Strong) (S) (S) (m) (Variable) (Variable) (V) (V)
Aldehydes, ketones, Esters, and carboxylic acids Group Frequency range (cm") Intensity C=0 1630-1780 (Strong) R 1690-1740 R 1680-1750 (S) R 1735-1750 RO RCOOH 1710-1780 (S) RCONH2 1630-1690
Aldehydes, ketones, Esters, and carboxylic acids Group Frequency Range (cm-1 ) Intensity (Strong) (S) (S) C O 1630-1780 O R H 1690-1740 O R R 1680-1750 O R RO 1735-1750 (S) RCOOH 1710-1780 (S) RCONH2 1630-1690 (S)
Frequency range of functional groups wave Numbr r cm 4000 30002500 2000 1500 13001200 1100 R-0-H R一H一H RLc|R R C一 C-C H C≡H C≡C- 6 8 9 wavelength microns
Frequency range of functional groups
ne peaks of trequency range for hydroxyl group and triple Wavr Num ber, cm bond Wave Num ber, cm 100030002500 v0003000z500 Saturated C-H ≡C-H Unsaturated C-H CH Stretch 0→H Wavelength, microns Wavclength, microns OH H-H
The peaks of frequency range for hydroxyl group and triple bond
The peaks of frequency range for carbonyl group and nitrile 认 aye Num ber,cm igroup Wave Num ber, cm 1000300025002000500 25002000 UnsaturatedC-H Saturated C-H Ester, Carbonyl ! Carbon- Carbon-C≡N Double bond Stretch Wavc length, microns Wavelength, micron' CN CH
The peaks of frequency range for carbonyl group and nitrile group