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Infrared Spectroscopy
IR spectroscopy is good for one thing in organic chemistry - identifying functional groups! It works by passing infrared light through a solid or liquid sample. Different functional groups absorb different energies of the infrared light.
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Example: IR Spectroscopy
Which molecule does the IR spectrum belong to?
- the peaks between 3100 and 3000 cm-1 are representative of sp2 C-H
- the structure on the left is the correct structure
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Example: IR Spectroscopy
Which molecule does the IR spectrum belong to?
- there is a peak at 2250 cm-1 which is for the -CN group
- there is no peak at 1700 cm-1 (would be present if there was a C=O)
- the structure on the right is the correct structure
Mark Yourself Question
- Grab a piece of paper and try this problem yourself.
- When you're done, check the "I have answered this question" box below.
- View the solution and report whether you got it right or wrong.
Which molecule does the IR spectrum belong to?
Mark Yourself Question
- Grab a piece of paper and try this problem yourself.
- When you're done, check the "I have answered this question" box below.
- View the solution and report whether you got it right or wrong.
Which molecule does the IR spectrum belong to?
