Common IR bands for organic molecules

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CHEM246 Organic Chemistry II

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19 Terms

1
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C-H bonds in general

around 3000

2
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C(sp3)-H alkanes

2850-3000

3
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C(sp2)-H alkenes

3000-3100

4
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C(sp2)-H aromatics

3050-3150

5
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C(sp)-H alkynes

3300

6
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C(sp2)-H aldehydes

two bands: 2700-2800, 2800-2900

7
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C=C alkene

1600-1680

8
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C=C aromatic

two bands: 1475 & 1600

9
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C=O in general

around 1700

10
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C=O ester

1730-1750

11
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C=O amide

1630-1680

12
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O-H alcohols

3200-3400

13
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O-H carboxylic acids

2400-3400

14
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N-H amines & amides

3100-3500

15
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C=N imines & oximes

1640-1690

16
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C≡N nitrles

2240-2260

17
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N=O nitro (R-NO2)

two bands: 1350 & 1550

18
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C-O alcohols, ethers, esters, carboxylic acids

1000-1300

19
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C-N amines, amides

1000-1350