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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: zain on May 20, 2007, 12:08:56 PM

Title: Infra Red Spectroscopy
Post by: zain on May 20, 2007, 12:08:56 PM

Hey guys,
I've got bit of a blunt and straight forward question.
I've got an exam tommorow which is about Carbon and also the 3 main types of spectroscopy.
The main thing i need to know is towards the left of an IR spectrum, how would u identify OH groups in different types (ketone, carboxylic acid etc). I know that an alcohol group is a broad peak at around 1800cm-1. But if you could please tell me any other typical peaks that are found in IR spectrums?..
Also my apologies... I don't know NMR very well either so this might go a bit off topic.
Any help is appreciated... as I have little time.
Many Thanks, Zain

Title: Re: Infra Red Spectroscopy
Post by: Yggdrasil on May 20, 2007, 03:52:52 PM

Here is a useful site with a list of common peaks in IR spectra:

http://www.cem.msu.edu/%7Ereusch/VirtualText/Spectrpy/InfraRed/infrared.htm#ir1

Title: Re: Infra Red Spectroscopy
Post by: dfx- on May 20, 2007, 07:38:14 PM

Quote from: zain on May 20, 2007, 12:08:56 PM

The main thing i need to know is towards the left of an IR spectrum, how would u identify OH groups in different types (ketone, carboxylic acid etc). I know that an alcohol group is a broad peak at around 1800cm-1.

OH is in amongst 3100cm^-1 - 3600cm^-1 along with a few other possibilities and C=O around 1700