N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
309
7.1 Alkanes
309
Assignment
Range
Comments
CH 2 γ
770–720
Medium, sometimes doublet
C–(CH 2 ) n –C
for n > 4 at ≈720;
for n < 4 at higher wavenumbers;
in cyclohexanes at ≈890,
weaker
Beyond normal range:
1060–800
Cycloalkanes, numerous bands, unreliable
C–D st
2200–2080
In general, substitution of L by isotope L':
ν ~ X–L' = ν
~ X–L
1 / m X +1 / m L'
1 / m X +1 / m L
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
309
7.1 Alkanes
309
Assignment
Range
Comments
CH 2 γ
770–720
Medium, sometimes doublet
C–(CH 2 ) n –C
for n > 4 at ≈720;
for n < 4 at higher wavenumbers;
in cyclohexanes at ≈890,
weaker
Beyond normal range:
1060–800
Cycloalkanes, numerous bands, unreliable
C–D st
2200–2080
In general, substitution of L by isotope L':
ν ~ X–L' = ν
~ X–L
1 / m X +1 / m L'
1 / m X +1 / m L