​​​​​​​​​​​​Characteristic Absorption

Wavenumber

cm-1

bond

functional group

36403610 (s, sh)

O-H stretch, free OH

alcohols, phenols

35003200 (s,b)

O-H stretch, H bonded

alcohols, phenols

34003250 (m)

NH stretch

primary, secondary amines, amides

33002500 (m)

OH stretch

carboxylic acids

33303270 (n, s)

-CC-H, CH stretch

alkynes (terminal)

31003000 (s)

CH stretch

aromatics

31003000 (m)

=CH stretch

alkenes

30002850 (m)

CH stretch

alkanes

28302695 (m)

HC=O: CH stretch

aldehydes

22602210 (v)

CN stretch

nitriles

22602100 (w)

CC stretch

alkynes

17601665 (s)

C=O stretch

carbonyls (general)

17601690 (s)

C=O stretch

carboxylic acids

17501735 (s)

C=O stretch

esters, saturated aliphatic

17401720 (s)

C=O stretch

aldehydes, saturated aliphatic

17301715 (s)

C=O stretch

α,β-unsaturated esters

1715 (s)

C=O stretch

ketones, saturated aliphatic

17101665 (s)

C=O stretch

α,β-unsaturated aldehyde, ketone

16801640 (m)

C=C stretch

alkenes

16501580 (m)

NH bend

primary amines

16001585 (m)

CC stretch (inring)

aromatics

15501475 (s)

N-O asymmetric stretch

nitro compounds

15001400 (m)

CC stretch (inring)

aromatics

14701450 (m)

CH bend

alkanes

13701350 (m)

CH rock

alkanes

13601290 (m)

NO symmetric stretch

nitro compounds

13351250 (s)

CN stretch

aromatic amines

13201000 (s)

CO stretch

alcohols, carboxylic acids, esters, ethers

13001150 (m)

CH wag (CH2X)

alkyl halides

13001150 (m)

CH wag (CH2X)

alkyl halides

12501020 (m)

CN stretch

aliphatic amines

1000650 (s)

=CH bend

alkenes

950910 (m)

OH bend

carboxylic acids

910665 (s, b)

NH wag

primary, secondary amines

900675 (s)

CH "oop"

aromatics

850550 (m)

CCl stretch

alkyl halides

725720 (m)

CH rock

alkanes

700610 (b, s)

CCH, CH bend

alkynes

690515 (m)

CBr stretch

alkyl halides

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