Organic Chemistry- IR Signals

WKU CHEM 340/341

C=C

1660 cm^-1

C≡C

2200 cm^-1

SP³ C-H

2900 cm^-1

SP² C-H

3100 cm^-1

SP C-H

3300 cm^-1

O-H

3300 cm^-1, Broad stretch w/ round tip

R-NH2

3300 cm ^-1, 2 sharp spikes

R2-NH

3300 cm^-1, 1 sharp spike

C=O

1700 cm^-1

Aldehyde C-H

2900 and 2700 cm^-1

C=N

1660 cm^-1

C≡N

2200 cm^-1

Aromatic

1600, 1500, and 1450 cm^-1