IR Flashcards by Teymour Taj

Q

X-H stretch region

A

4000-2500

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Q

Triple bond stretch region

A

2500-2000

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Q

Double bond stretch region

A

2000-1500

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Q

Fingerprint region

A

1500-500

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Q

sp3 C-H

A

2900-3000

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Q

sp2 C-H

A

3000-3100

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Q

sp C-H

A

3300

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Q

N-H

A

3300 (sharp)

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Q

N-H (NH2)

A

3300 symmetric (sharp)
3400 antisymmetric (sharp)

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Q

O-H

A

with H bonding: 3600-3200 (broad)

without: sharp

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Q

C≡N

A

2250 (sharp)

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Q

C≡C

A

2100-2250 (weak)

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Q

C=C

A

1635-1690 (weak)

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Q

C-C (aromatic)

A

1625-1450 (multiple peaks, med to weak)

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Q

NO2

A

1350 symmetric
1530 antisymmetric

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Q

C=O (ketone)

A

1715

Q

C=O (acid chloride)

A

1750-1820

Q

C=O (amide)

A

1640-1690

Q

C=O (carboxylic acid)

A

1730

Q

C=O (ester)

A

1745

Q

C=O (aldehyde)

A

1730

Q

C=O (acid anhydride)

A

1750 symmetric
1820 antisymmetric

Q

Effect of conjugation on C=O

A

-25
Weakens carbonyl

Q

Effect of removing C from ring on C=O (starting with cyclohexanone)

A

+35
Strained geometry harder to stretch

Q

Effect of induction on C=O strength

A

Strengthens carbonyl, increases stretch frequency