Infra Red Spectroscopy Interpreting Spectra
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3C h e m g u i d e – q u e s t i o n s
INFRA-RED SPECTROSCOPY: INTERPRETING SPECTRA
1. This question is going to give you three isomeric compounds and three IR spectra. What you have
to do is to match each compound to its correct spectrum. You will find a list of useful infrared
absorption data after the three spectra.
The three compounds you are concerned with are
•
propanoic acid: CH
CH
COOH
3
2
•
methyl ethanoate: CH
COOCH
3
3
•
hydroxypropanone: CH
COCH
OH
3
2
a) Draw full structural formulae for the three compounds so that you can see exactly which bonds
you need to think about.
b) Decide which compound corresponds to each of the spectra below, explaining how you made
your decisions.
The spectra are taken from the SDBS (SDBSWeb : (National Institute of
Advanced Industrial Science and Technology, 14/8/2014). You may need to enlarge this page to
read the numbers - I apologise for that, but it is a lot quicker than redrawing the spectra! Notice the
change of scale either side of 2000 cm
-1
.
Spectrum 1:
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