N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
365
7.12 Miscellaneous Compounds
365
7.12 Miscellaneous Compounds
7.12.1 Silicon Compounds
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
Si–H st
2250–2090
Medium. In Raman, medium to strong
Subranges:
2160–2090
R 3 Si–H; also for R as H; for SiH 3 : 2 bands
≈2250
hal–Si–H
2220–2120
(Si–O)Si–H
Si–H δ
1010–700
Strong, broad, generally 2 bands
(Si–)CH 3 δ as ≈1410
Weak
(Si–)CH 3 δ sy 1275–1260
Very strong, sharp, typical for SiCH 3 , not split
for Si(CH 3 ) 2
(Si–)CH 3 γ
860–760
≈765
SiCH 3
≈855, ≈800
Si(CH 3 ) 2
≈840, ≈765
Si(CH 3 ) 3
Si–O st
1110–1000,
900– <600
1110–1000,
850–800
Si–O–C
1090–1030,
< 650
Si–O–Si
900–800
Si–OH
3700–3200
Si–OH st
≈1030
Si–OH δ
Si–C st
850–650
Si–N st
1250–830
Subranges:
950–830
Si–N–Si
≈3400
Si 2 NH st
Si–H st
%T
400
800
1200
1600
2000
2800
3600
Si–H δ