N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
368
7 IR
Assignment
Range
Comments
1240–1205
P O
P
O
O R
R
R
R
1310–1260
P O
P
O
O O R
OR
RO
RO
≈1195
P O
P
O
O OH
O R
R
H O
≈1275
P O
P
O
O OR
NR 2
R 2 N
RO
1265–1250
P O
P
O
O R
O R
RO
R
≈1300, ≈1240
P O
P
O
O NR 2
NR 2
RO
RO
≈1250
P O
P
O
O OR
O H
H O
RO
≈1235
P O
P
O
O NR 2
NR 2
R 2 N
R 2 N
1265–1240
R 2 (X)P=O, X: F, Cl, Br
1365–1260
R(X) 2 P=O, X: F, Cl, Br
1330–1280
(RO) 2 (X)P=O, X: F, Cl, Br
1365–1260
RO(X) 2 P=O, X: F, Cl, Br
P=N
1500–1170
P–OH δ
≈1280
Weak, of no practical significance
P–C st
800–700
Intensity varies widely, of no practical significance
P–H δ
1090–910
Strong, for (RO) 2 HP=O very strong
P–N–C st
1110–930,
770–680
P=N–al st
1500–1230
P=N–ar st
1390–1300
P=N–C=O st
1370–1310
P=N–PR 2 st
1295–1170
P=S st
750–580
Intensity varies widely
P–S st
<600
(P–)CH 3 δ sy 1310–1280
P–F st
905–760