IR Spectroscopy

Alcohol O-H

3200-3600 BROAD

Carboxylic Acid O-H

2200-3600 MORE BROAD

N-H

3350-3500 WEAK

Primary Amine NH2 signals?

2 signals Asymmetric vs. Symmetric Stretching

Secondary Amine NH Signals?

1 signal

Tertiary Amine

No signal as N-H Bond

sp C-H

3300 SHARP Signal

sp2 C-H

3000-3100 ABOVE 3000

sp3 C-H

2850-3000 BELOW 3000

C≡N (Nitriles)

2200-2300

C=C

1600-1700 Weak

C=O

1650-1820 (1700) STRONG

Anhydride C=O

-1820-1760 TWO Signals

Acid chloride C=O

1790

Ester C=O

-1735

Aldehyde C=O

-1730

Ketone C=O

1720

Carboxylic acid C=O

-1715

Amide C=O

-1650

Aldehyde C–H

-2750 & 2850 TWO signals

C≡C

-2100-2200

C-O - Carbonyl

1250-1350

C-O

-1000-1100

C-N

1000-1200

C-Cl

600-800

C-Br

500-600