N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
363
7.11 Carbonyl Compounds
363
Assignment
Range
Comments
N–H st
3500–3250
Medium, two bands for NH 2 ,
one for NH
Carbamates
3500–3200
Medium, two bands for NH 2 Ureas
N–H δ
1650–1500
Medium
Carbamates
NH 2 δ
1650–1600
Medium
Ureas
N–CO–O st as
1270–1210
Medium
Carbamates
N–CO–O st sy
1050–850
Weak
Carbamates
C–N–H δ
1600–1500
Weak
Ureas
Examples (v ~ in cm -1 )
H 2 N
O
O
in CHCl 3 :
1725
N
O
O
H
in CCl 4 :
1727
N
O
O
in CHCl 3 :
1684
H 2 N
O
O
N H 2
O
O
solid:
1690
O
O
O
in CCl 4 :
1758
in CHCl 3 :
1751
O
O
O
in CCl 4 :
1748
O
O
O
in CCl 4 :
1786
O
O
O
in CCl 4 :
1822
1748
N
S
O
in CCl 4 :
1662
S
O
O
in CCl 4 : 1719
S
S
O
in CCl 4 : 1653
O
S
O
in CCl 4 :
1757
S
S
O
in CCl 4 : 1718
1677
1640
S
S
S
neat: 1076
S
S
S
solid: 1058
in CCl 4 :
1083
1079
H 2 N
N H 2
O
solid: 1679
1627
N
N H 2
O
H
solid: 1645
1567
1418
N
NH 2
O
solid: 1656
1610
1511