Infrared Interpretation – interpret all absorptions in the 4000-1400 cm-1 region of the IR spectra of 2-methyl-4-heptanol. Label the recorded IR spectra and provide an indication of the impurities present, if any.
Infrared Interpretation – interpret all absorptions in the 4000-1400 cm-1 region of the IR spectra of 2-methyl-4-heptanol. Label the recorded IR spectra and provide an indication of the impurities present, if any.
Chapter28: Atomic Spectroscopy
Section: Chapter Questions
Problem 28.2QAP
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Infrared Interpretation – interpret all absorptions in the 4000-1400 cm-1 region of the IR spectra of 2-methyl-4-heptanol. Label the recorded IR spectra and provide an indication of the impurities present, if any.
Transcribed Image Text:Correlation Table for Infrared Spectroscopy
Frequency of Intensity/Shape
absorption
(cm-1)
3650-3590
3600-3200
3400-2400
3500-3300
3340-3270
3100-3000
2260-2100
1800 and 1750
1810-1760
1750-1730
1740-1680
2960-2850
Strong/sharp
2850-2810 and Medium/sharp
2750-2700
2260-2220
1730-1680*
1720-1680
1700-1630
1680-1620
Strong/sharp
1600-1450
Strong/broad
Strong/ very broad
Medium to strong/
sharp
Strong/sharp
Weak to medium
Medium to strong/
sharp
Weak to medium/
sharp
Strong/sharp
Strong/sharp
Strong/sharp
Strong/sharp
Strong/sharp
Strong/sharp
Strong/sharp
A-13
Weak to medium/
sharp
Variable intensity/
sharp
Bond/Class of
Compounds
O-H/ alcohols, phenols
O-H/ alcohols, phenols
O-H/ carboxylic acids
N-H/ 1° and 2° amines
and amides
C(sp)-H/ terminal
alkynes
C(sp²)-H/ alkenes,
aromatic compounds
C(sp³)-H/ alkanes
C-H/ aldehydes
C=N/nitriles
C=C/ alkynes
C=0/anhydrides
C=0/ acid chlorides
C=0/esters
C=0/ aldehydes
C=0/ ketones
C=0/ carboxylic acids
C=0/amides
C=C/ alkenes
CC aromatic
Additional Comments
Free (not hydrogen bonded)
OH group
Hydrogen bonded OH group
Dimers of carboxylic acids
1° amines and amides give
two absorptions, 2⁰ - one
Usually two absorptions,
one-2820, another -2720
Might not be visible in internal
alkynes
Always two absorptions
Aliphatic: 1740-1720
Aromatic: 1720-1680
Aliphatic: 1730-1700
Aromatic: 1700-1680
Dimer, 1720-1700 aliphatic,
1700-1680 aromatic
1 and 2 amides 1700-1670,
3⁰-1670-1630
1640-1620 if a conjugated
double bond
*Angle strain in the carbonyl group, caused by the size of a small ring, increases the frequency of
the absorption position of the C=0 bond of cyclic ketones; in cyclohexanone the absorption shows
at 1715 cm-¹, in cyclopentanone at 1750 cm-¹, and in cyclobutanone at 1785 cm-¹.
![3500
3000
2500
Wavenumber cm-1
2000
1500
1000
500
3345.51
2955.65
2927.88
2870.43
1466.22
382.51
1148.31
1121.83
1025.62
944.75
900.2
838.72
606.96
591.02
571.07
554.66
544.06
499.62
472.28
459.78
450.11
441.82
418.52
65 70
Transmittance [%]
75 80 85
95
90
humhy
100
BRUKER
2-methyl-4-heptanol](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4187eb67-fab6-4738-a29b-fa11c290df86%2F512b9b4e-f2de-4257-8dc7-1a0f7d0f2751%2Fbqefh2e_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3500
3000
2500
Wavenumber cm-1
2000
1500
1000
500
3345.51
2955.65
2927.88
2870.43
1466.22
382.51
1148.31
1121.83
1025.62
944.75
900.2
838.72
606.96
591.02
571.07
554.66
544.06
499.62
472.28
459.78
450.11
441.82
418.52
65 70
Transmittance [%]
75 80 85
95
90
humhy
100
BRUKER
2-methyl-4-heptanol
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