N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
339
7.9 Nitrogen Compounds
339
7.9.7 Cyanates and Isocyanates
Cyanates
Isocyanates
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
OC– – – N st
2260–2130
Medium to strong
2220–2130
(OC – – – N) – st as
1335–1290
(OC – – – N) – st sy
C–O st
1200–1080
Strong
N=C=O st as
2280–2230
≈2300
Strong, sharp. In Raman, weak or absent
–CF 2 –NCO
N=C=O st sy
1450–1380
Weak
Beyond normal range:
2220–2130
(N=C=O) –
C N st
%T
400
800
1200
1600
2000
2800
3600
C–O st
–N=C=O st as
%T
400
800
1200
1600
2000
2800
3600
–N=C=O st sy
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
339
7.9 Nitrogen Compounds
339
7.9.7 Cyanates and Isocyanates
Cyanates
Isocyanates
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
OC– – – N st
2260–2130
Medium to strong
2220–2130
(OC – – – N) – st as
1335–1290
(OC – – – N) – st sy
C–O st
1200–1080
Strong
N=C=O st as
2280–2230
≈2300
Strong, sharp. In Raman, weak or absent
–CF 2 –NCO
N=C=O st sy
1450–1380
Weak
Beyond normal range:
2220–2130
(N=C=O) –
C N st
%T
400
800
1200
1600
2000
2800
3600
C–O st
–N=C=O st as
%T
400
800
1200
1600
2000
2800
3600
–N=C=O st sy