N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
336
7 IR
Examples (v ~ in cm -1 )
N
1667
NH
1603
N
1637
N OH
1675
N OH
1672 (solid)
1662 (gas)
N
OH
1684
7.9.4 Azo, Azoxy, and Azothio Compounds
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
N=N st
1580–1400
Very weak, missing in compounds of high symmetry. In Raman, generally strong
1480–1450
1335–1315
N N
O
st as (mainly N=N st)
st sy (mainly N–O st)
≈1450
≈1060
N N
S
1410–1175
N N
O
O
Dimers of C-nitroso compounds
Subranges:
1290–1175
Aliphatic trans
1425–1385,
1345–1320
Aliphatic cis
1300–1250
Aromatic trans
≈1410,
≈1395
Aromatic cis
N=N st
%T
400
800
1200
1600
2000
2800
3600
st as (mainly N=N st)
st sy (mainly N–S st)
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
336
7 IR
Examples (v ~ in cm -1 )
N
1667
NH
1603
N
1637
N OH
1675
N OH
1672 (solid)
1662 (gas)
N
OH
1684
7.9.4 Azo, Azoxy, and Azothio Compounds
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
N=N st
1580–1400
Very weak, missing in compounds of high symmetry. In Raman, generally strong
1480–1450
1335–1315
N N
O
st as (mainly N=N st)
st sy (mainly N–O st)
≈1450
≈1060
N N
S
1410–1175
N N
O
O
Dimers of C-nitroso compounds
Subranges:
1290–1175
Aliphatic trans
1425–1385,
1345–1320
Aliphatic cis
1300–1250
Aromatic trans
≈1410,
≈1395
Aromatic cis
N=N st
%T
400
800
1200
1600
2000
2800
3600
st as (mainly N=N st)
st sy (mainly N–S st)