N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
335
7.9 Nitrogen Compounds
335
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
C=N st
1690–1520
Generally strong. In Raman, generally strong
Subranges:
≈1670
R–CH=N–R'
R, R': al
≈1645
R–CH=N–R'
R or R': conjugated
≈1630
R–CH=N–R'
R, R': conjugated
≈1655
≈1645
≈1635
N
R
R"
R'
R, R', R'': al
R: conjugated
R, R': conjugated
≈1555
O
N
Additional band: ≈1655 C=O st
≈1645
≈1625
R
NH
R'
R, R': al
R, R': conjugated
1685–1580
R
N
H 2 N
R
Additional band
at 1540–1515 in:
R
N
RH N
R
1670–1600
CH=N–N=CH
1690–1645
RO
NH
RO
Additional bands: NH st: ≈3300,
C–O st: ≈1325, ≈1100
1680–1635
RO
N H 2
RO
+
Additional bands:
NH 2
+ st: ≈3000
NH 2
+ δ: 1590–1540
2050–2000
C=C=N; ketimines, very strong, sometimes
doublet
1580–1520
Quinone oximes: C=O st 1680–1620
1685–1650
Aliphatic oximes
1650–1615
Aromatic oximes
1690–1645
O–C=N
1640–1605
S–C=N
1640–1580
S–S–C=N
OH st
3600–2700
Strong
Subranges:
≈3600
Free
3300–3100
H-bonded, broad
≥ ≈2700
Quinone oximes, more than one band
OH δ
1475–1315
Of no practical significance
N–O st
1050–400
Of no practical significance