N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
343
7.10 Sulfur Compounds
343
7.10.2 Sulfoxides and Sulfones
Sulfoxides
Sulfones
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
S=O st
1225–980
Strong, sometimes multiple bands. In Raman,
weak to medium
Subranges:
1060–1015
R–SO–R
≈1100
R–SO–OH
S–O st 870–810
OH st free ≈3700,
H-bonded ≈2900, ≈2500
≈1135
R–SO–OR
S–O st 740–720, 710–690
1225–1195
RO–SO–OR
≈1135
R–SO–Cl
≈1030, ≈980
R–SO 2
–
≈1100, ≈1050
R=SO
N=SO: ≈1250, ≈1135
%T
400
800
1200
1600
2000
2800
3600
S=O st
%T
400
800
1200
1600
2000
2800
3600
SO 2 st as
S–O st
SO 2 st sy