Transcription of Table 1: Principal IR Absorptions for Certain Functional ...
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Table 1: Principal IR Absorptions for Certain Functional ...
Table 1: Principal IR Absorptions for Certain Functional Groups Absorption Ranges(cm-1). Functional Group Names Type of Vibration & [Look for a single absorption causing IR absorption in these regions, unless stated otherwise.]. Example compounds 3000-2800 H-C-H Asymmetric &. Alkanes: Symmetric Stretch (Note: The Absorptions can be seen as several H distinct peaks in this region.). H H. C Methane H 1500-1440 H-C-H Bend C=C-H Asymmetric Alkenes: 3100-3000. Stretch H. H C-C=C Symmetric H3C C 1-Propene 1675-1600. H. Stretch 3300-3200 C H Stretch Alkynes: HC C CH3 Propyne 2200-2100 C C Stretch Aromatic Rings: C=C-H Asymmetric 3100-3000. H Stretch H C H C-C=C Symmetric C C 1600-1580. C C. Benzene Stretch H C H. C-C=C Asymmetric H 1500-1450. Stretch Phenols & Alcohols: Hydrogen-bonded O-H. H. 3600-3100. H Stretch H C OH H OH. C C C (This peak usually appears much C C H (Note: Phenols MUST have broader than the other IR.))
Amines—Secondary: N-H Stretch N CH3 H N-Methylethylamine 1550-1450 N-H Bend Nitriles: C C N H H H Methanenitrile 2300-2200 CNStretch 1600-1500 N=O Stretch Nitro Groups: H C 3 N + O O Nitromethane (Note: Both peaks are <200 cm-1 apart.) 1400-1300 N=O Bend 3500-3100 N-H Stretch (similar to amines) 1670-1600 C=O Stretch Amides: H C 3 C NH 2 O ...
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