Functional Group

Characteristic

Absorption (cm^-1)

Notes

Alkyl C-H Stretch

2950-2850 (m or s)

烷烃C-H普遍存在，

通常在决定结构时用处不大

Alkenyl C-H Stretch

Alkenyl C=C Stretch

3100-3010 (m)

1680-1620 (v)

3000cm-1以上的吸收峰

通常是不饱和C的诊断

Alkynyl C-H Stretch

Alkynyl C≡C Stretch

~3300 (s)

2260-2100 (v)

Aromatic C-H Stretch

Aromatic C-H Bending

Aromatic C=C Bending

~3030 (v)

860-680 (s)

1700-1500 (m,m)

Alcohol/Phenol

O-H Stretch

3550-3200 (broad, s)

更多信息请参阅

自由与氢键羟基

Carboxylic Acid O-H Stretch

3000-2500 (broad, v)

Amine N-H Stretch

3500-3300 (m)

伯胺有两个N-H拉伸吸收，

仲胺只有一个，四聚胺没有

Nitrile C≡N Stretch

2260-2220 (m)

Aldehyde C=O Stretch

Ketone C=O Stretch

Ester C=O Stretch

Carboxylic Acid C=O Stretch

Amide C=O Stretch

1740 - 1690 (s)

1750 - 1680 (s)

1750 - 1735 (s)

1780 - 1710 (s)

1690 - 1630 (s)

羰基伸缩吸收是最强的吸之一，既可确定羰基数量(假设峰不重叠)，也可估计类型，在结构确定中非常有用

Amide N-H Stretch

3700 - 3500 (m)

与胺一样，酰胺根据其类型产生0到2个N-H吸收