IR signal Frequencies - CHEM3411 B
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Important signals listed in Dr. B's summary sheet and in the table from p.169 of the textbook
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1
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What functional group has this strong, broad signal at \~3400-3300cm-1?
alcohol
2
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At what frequency is the signal for this structural unit found?
3200-3600
3
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At what frequency is the signal for this structural unit found?
2200-3600
4
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At what frequency is the signal for this structural unit found?
3350-3500
5
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At what frequency is the signal for this structural unit found?
\~3300
6
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At what frequency is the signal for this structural unit found?
3000-3100
7
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At what frequency is the signal for this structural unit found?
2850-3000
8
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At what frequency is the signal for this structural unit found?
2750-2850
9
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At what frequency is the signal for this structural unit found?
2100-2200
10
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At what frequency is the signal for this structural unit found?
2200-2300
11
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At what frequency is the signal for this structural unit found?
1750-1850
12
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At what frequency is the signal for this structural unit found?
1700-1750
13
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At what frequency is the signal for this structural unit found?
1700-1750
14
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At what frequency is the signal for this structural unit found?
1680-1750
15
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At what frequency is the signal for this structural unit found?
1650-1700
16
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At what frequency is the signal for this structural unit found?
1600-1700
17
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At what frequency is the signal for this structural unit found?
1450-1600, 1650-2000
18
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What produces 2 medium peaks at a frequency of \~3400-3200cm-1?
primary amine
19
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What produces 1 weak peak at a frequency of \~3400-3200cm-1?
secondary amine
20
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What produces a strong and very broad signal at 3500-2400cm-1?
carboxylic acid
21
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What produces a strong, sharp signal at \~3300cm-1?
alkyne C-H
22
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What produces a medium to weak signal just above 3000cm-1?
unsaturated C-H
23
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What produces a strong signal just below 3000cm-1?
saturated C-H
24
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What produces a pair of medium to weak signals at 2900-2800 and 2800-2700?
aldehyde
25
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What produces a medium, sharp signal at 2260-2220cm-1?
nitrile
26
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What produces a medium, sharp signal at 2260-2100cm-1?
alkyne (Don’t confuse with alkyne attached to H!)
27
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What has a strong signal at \~2160-2120cm-1?
azide (N3)
28
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What has a strong signal at \~1700cm-1?
carbonyl
29
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What is the frequency range for the signal produced by this carbonyl?
\~1750-1700cm-1
30
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What is the frequency range for the signal produced by this carbonyl?
\~1750-1680cm-1
31
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What is the frequency range for the signal produced by this carbonyl?
\~1700-1650cm-1
32
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What produces a medium to weak signal at \~1700-1600cm-1?
alkene
33
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What produces a pair of strong to medium signals at \~1600 & 1475cm-1?
benzene
34
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What produces a pair of strong to medium signals at \~1550 & 1350cm-1?
nitro (NO2)
35
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What produces a strong to medium signal at \~1250-1000cm-1 with “shouldering”?
C-O single bond
36
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At what frequency is the signal for this structural unit found?
600-800
37
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At what frequency is the signal for this structural unit found?
500-600
38
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At what frequency is the signal for this structural unit found?
1000-1100
39
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At what frequency is the signal for this structural unit found?
1250-1350
40
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At what frequency is the signal for this structural unit found?
1000-1200
41
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At what frequency is the signal for this structural unit found?
900-920, 980-100
42
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At what frequency is the signal for this structural unit found?
880-900
43
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At what frequency is the signal for this structural unit found?
1370, 1380
44
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At what frequency is the signal for this structural unit found?
1370, 1390
Note 
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