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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: AussieKenDoll on March 08, 2019, 03:38:58 AM

Title: IR spectroscopy functional group determination?
Post by: AussieKenDoll on March 08, 2019, 03:38:58 AM

Look at the picture I attached, according to IR  spectrum there are C=O and 0-H bond at  1705 cm–1 and 3450 cm–1 respectively, but there are many peaks on the spectrum, what do they indicate?

Title: Re: IR spectroscopy functional group determination?
Post by: Corribus on March 08, 2019, 10:38:41 AM

You'll never be able to assign all them them definitively. Many of them correspond to various C-H stretches, bends, and rocking motions. You'll also have some absorptions related to C-O stretches and bends, and some C-C motions as well.

Title: Re: IR spectroscopy functional group determination?
Post by: wildfyr on March 08, 2019, 01:30:34 PM

The C-H stretches around 2950 can be somewhat well assigned, but after that it gets pretty difficult.