Infrared Spectroscopy Flashcards
(25 cards)
0
Q
Carbon=carbon
Isolated
A
1640-1680
1
Q
Carbon-carbon
A
1200
2
Q
Carbon=carbon
Conjugated
A
1620-1640
3
Q
Carbon=carbon
Aromatic
A
1600
4
Q
Carbon•••carbon
Triple bond
Terminal
A
2100-2200
5
Q
Carbon•••carbon
Triple bond
Internal
A
Weak/absent
6
Q
-C-H
sp3
A
2800-3000
7
Q
=C-H
sp2
A
3000-3100
Can alert to weak C=C stretch
8
Q
•••C-H
sp
A
3300
Sharp
9
Q
Alcohol O-H
A
3300
Broad
10
Q
Acid O-H
A
3000
Broad
11
Q
Amine N-H
A
3300
Broad with spikes
12
Q
C-O
A
1000-1200
Unreliable
Look for absence rather than peak
13
Q
Ketone R2C=O
A
1710
Overtones 3400
14
Q
Aldehyde RHC=O
A
1725
C-H dips 2700, 2800
Overtones 3400
15
Q
Acid ROHC=O
A
1710
O-H stretch 2500-3500
Overtone 3400
16
Q
Conjugated C=O
A
1685
17
Q
(?)NC=O
A
1640-1680
18
Q
Ester RORC=O
A
1735
19
Q
Cyclopentyl C=O
A
1785
20
Q
C-N
A
1200
Strong
21
Q
C=N
A
1660
Strong
22
Q
C•••N
Triple bond
A
2200+
Strong
23
Q
Anhydride
O=C-O-C=O
A
Double spikes
1750, 1830
24
Phenyl-X
4 small spikes
| 2000-1700
