Structural Unit Frequencies

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Alcohols

3200-3600 broad

Carboxylic Acids

2200-3600 very broad

Hydrogens on a Nitrogen

3350-3500 More peaks depending on # of hydrogens

Hydrogens on a SP hybridized carbon

~3300

Hydrogens on a SP2 hybridized carbon

3000-3100

Hydrogens on a SP3 hybridized carbon

2850-3000

sp2 carbon double bonds

1600-1700

Hydrogens attached to an Aldehide

2750 and 2850, two weak signals

Aromatic Rings

1450-1600 or 1650-2000

Anhydrides

~1820 and ~1760

Acid chloride

~1790, additionally has a signal around 600-800

Ester

~1735, additional signal at 1250-1350

Aldehyde

1730, Additional unique, weak signals at 2750 and 2850

Ketone

1720

Carboxylic acid

1715, HUGE signal from 2200 to 3600

Amide

1650 signal distinguishes from a Amine, additional signals at 3350-3500 depending on # of hydrogens on N.

Amine

Unique 1000-1200 signal

Triple bond

2100-2200

CN triple bond

2200-2300