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Old 01-07-2008, 11:43 PM   #1
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Question to Bla~ahs... Or anyone good in Chem

Does anyone know how to read NMR Spectroscopy graphs? I have looked all over the net trying to find out how, but I found so little...

Can you please help?
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Old 01-07-2008, 11:44 PM   #2
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Sorry I have no idea what that is, LOL.
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Old 01-07-2008, 11:50 PM   #3
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Hmm, great help indeed.
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Old 01-08-2008, 12:45 AM   #4
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Dont chem book have them? or better, ask a nice, good chem teacher
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Old 01-08-2008, 02:06 AM   #5
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Originally Posted by viasta View Post
Dont chem book have them? or better, ask a nice, good chem teacher
That one might be more harder to find than how to read NMR graphs using Google.
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Old 01-08-2008, 02:27 AM   #6
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You would have to consult your chemistry professor in this regard. Many textbooks will not have this information, and it is difficult to describe.

This is a carbon-13 NMR spectra for ethanol.



Each peak identifies a carbon atom in a different environment within the molecule. In this case there are two peaks because there are two different environments for the carbons.

The carbon in the CH3 group is attached to 3 hydrogens and a carbon. The carbon in the CH2 group is attached to 2 hydrogens, a carbon and an oxygen.

Keep in mind that the external magnetic field experienced by the carbon nuclei is affected by the electronegativity of the atoms attached to them. The effect of this is that the chemical shift of the carbon increases if it is attached to atoms, such as oxygen. Therefore, the peak is at about 60 is due to the CH2 group because it has a more electronegative atom attached.

Hopefully it somewhat answers your question. I need to collect more green bars, so +rep helps too. >_>
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Old 01-08-2008, 02:29 AM   #7
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Originally Posted by Valentines View Post
Hmm, great help indeed.
I wanna do things to you even more now.
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Old 01-08-2008, 08:12 PM   #8
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Originally Posted by Rightclaw View Post
I wanna do things to you even more now.
How many does that make now?
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