Organic Chemistry Semester 1 LABORATORY MANUAL - Moravian ...

Infrared Spectroscopy Appendix C6 Part V. Techniques and Theory
Applications:
1. As you noticed in your above analyses, most organic functional groups contain more than
one type of bond. It is useful to recognize the pattern of IR absorptions that are related to the
various bonds found in each. Use your assignments from the Exploration above to predict
approximate values of important IR ν's for the following compounds and explain the logic of
your assignments:
O
(a.)
O H
Functional group(s):
Expected ν’s (cm -1 ):
Explanation:
(c.)
CH 2
NH 2
Functional group(s):
Expected ν’s (cm -1 ):
Explanation:
O
(b.)
NH 2
Functional group(s):
Expected ν’s (cm -1 ):
Explanation:
O
(d.)
H
Functional group(s):
Expected ν’s (cm -1 ):
Explanation:
2. What functional groups are likely to be present in each of the following compounds?
Explain how your predictions were made.
a. C 7 H 6 O 3050, 2820, 2740, 1705 (st), 1600, 1580, 1430 cm -1
Functional group(s):
Explanation:
b. C 11 H 12 O 2 3030, 2960, 1700 (st), 1630, 1560, 1480, 1440, 1160 cm -
1 Functional group(s):
Explanation:
c. C 5 H 8 O 2935, 1670 st, 1620 cm -1 Functional group(s):
Explanation:
d. C 10 H 14 3030, 2940, 1520, 1460, 1420 cm -1 Functional group(s):
Explanation: