N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
338
7 IR
Examples (v ~ in cm -1 )
CN
2222
CN
2235
CN
2252
N C
CN
2273
NC
CN
2235
N C
CN
2252
N C
N C
CN
CN
2257
2222
CN
2245
CN
OH
2220
NaCN, KCN 2080–2070
AgCN
2178
NH 2 –CN
2268
7.9.6 Diazo Compounds
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
–N + – – – N st
2310–2130
Medium, frequency depends on anion
In the same range: C– – – C st, X=Y=Z st as, NH + st, PH st,
POH st, SiH st, BH st
C=N + =N –
2050–2010
Very strong
Subranges:
2050–2035
2035–2010
R–CH=N + =N – , R: al or ar
R 2 –C=N + =N – , R: al or ar
Beyond normal range:
2100–2050
R–CO–C=N + =N –
C=O st ≈1645 (R: al)
C=O st ≈1615 (R: ar)
C=N + =N – st sy:
≈1350, strong
2180–2010
O
N N
+ –
C=O st 1655–1560