N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
322
7 IR
7.7 Halogen Compounds
7.7.1 Fluoro Compounds
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
C–F st
1400–1000
Strong, often more than one band (rotational
isomers), often not resolved. In Raman, weak
to medium
Subranges:
1100–1000
1150–1000
al CF 2 (FC–H st: 3080–2990)
al CF 2
1350–1100
al CF 3
1350–1150
C=CF
≈1745
C=CF 2 st
1250–1100
ar CF
In the same range: strong bands for C–O st, NO 2 st sym,
C=S st, S=O st
CF 2
780–680
Medium or weak, assignment uncertain
CF 3
780–680
(C–F δ?)
S–F st
815–755
Strong
P–F st
1110–760
Si–F st
980–820
B–F st
1500–800
C–F st
%T
400
800
1200
1600
2000
2800
3600
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
322
7 IR
7.7 Halogen Compounds
7.7.1 Fluoro Compounds
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
C–F st
1400–1000
Strong, often more than one band (rotational
isomers), often not resolved. In Raman, weak
to medium
Subranges:
1100–1000
1150–1000
al CF 2 (FC–H st: 3080–2990)
al CF 2
1350–1100
al CF 3
1350–1150
C=CF
≈1745
C=CF 2 st
1250–1100
ar CF
In the same range: strong bands for C–O st, NO 2 st sym,
C=S st, S=O st
CF 2
780–680
Medium or weak, assignment uncertain
CF 3
780–680
(C–F δ?)
S–F st
815–755
Strong
P–F st
1110–760
Si–F st
980–820
B–F st
1500–800
C–F st
%T
400
800
1200
1600
2000
2800
3600