IR Spectroscopy Problem Set 1
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Transcript of IR Spectroscopy Problem Set 1
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7/29/2019 IR Spectroscopy Problem Set 1
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CHEM 3012 - Spring 2009 Name ______________________________
Organic Chemistry Laboratory I
Problem Set 3Infrared Spectroscopy
Infrared (IR) absorption spectroscopy is the measure of the amount of radiation
absorbed by compounds within the infrared region of the electromagnetic spectrum. Theabsorption of infrared radiation is a quantized process, which means only selected
frequencies (energies) of infrared radiation are absorbed by a molecule. Each absorption
band corresponds to energy changes related to the two types of vibration, stretching and
bending of chemical bonds, in covalent molecules. From these absorption bands, orpeaks in the spectrum, the presence or absence of certainfunctional groups of a
compound can be determined.
For this problem set:
a) Match the four structures with the four IR spectra in each set. Use a table of
specific IR absorptions for various functional groups to help you identify
the structures.
b) Indicate and label the important peaks in each spectrum by drawing the type of
bond next to its corresponding peak.
c) Label all the functional groups that are present in each compound.
d) Show your work.
Required Reading: Wade Ch. 12, pg 508-537 (or Mayo pg 146-162)
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Problem Set 3IR Spectroscopy 81
1. a) b)
answer ______________________ answer ______________________
c) d)
answer ______________________ answer ______________________
OH
O
HO
O
OH
O
OH
Choices
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Problem Set 3IR Spectroscopy 82
2. a) b)
answer ______________________ answer ______________________
c) d)
answer ______________________ answer ______________________
NH2
NH2
O
N
O
H
N
N
Choices
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Problem Set 3IR Spectroscopy 83
3. a) b)
answer ______________________ answer ______________________
c) d)
answer ______________________ answer ______________________
CN
Choices
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Problem Set 3IR Spectroscopy 84
4. a) b)
answer ______________________ answer ______________________
c) d)
answer ______________________ answer ______________________
O
CO2H
NOH
H
CN
NH2
Choices
