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Topic: Reading NMR  (Read 4657 times)

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Offline explodinglunch

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Reading NMR
« on: April 19, 2012, 04:34:36 PM »
I'm having trouble determining a structure from this NMR.  From the corresponding IR, I know that it has N-H and C-H bonds.

Here is the NMR spectrum:
http://i.imgur.com/dXI0i.jpg


Any ideas?

Offline Wald_ron

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Re: Reading NMR
« Reply #1 on: April 19, 2012, 05:08:17 PM »
Whats the chemical formula? and can you post the IR
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Offline explodinglunch

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Re: Reading NMR
« Reply #2 on: April 19, 2012, 05:30:11 PM »
No chemical formula given.


IR:
http://i.imgur.com/BhRZX.jpg

Offline hypervalent_iodine

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Re: Reading NMR
« Reply #3 on: April 20, 2012, 12:11:05 AM »
You're not given anything else? You must have a very facetious professor if this is for class work.

To be honest, there's not much you can garner from any of that except a little bit about roughly what type of molecule it could be. The IR peak at 3282 could be a secondary amine or it could just as well be a hydroxy group. The splitting in the NMR is so obfuscated that it is pretty much impossible for you to discern any of the multiplicities, so it's not much help without a molecular formula of some kind. 

Do you not have a mass spec? Or if not, can you get one? A carbon spectra would also be good. DEPT or proton coupled 13C would be even better.

Offline ATMyller

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Re: Reading NMR
« Reply #4 on: April 20, 2012, 07:10:48 AM »
Is the spectra calibrated correctly? looks like TMS signal is at 0.7ppm and choloform at 7.9ppm, not 0.0ppm and 7.2ppm as they should be in HNMR. Determine the multiplicities and calculate integrales so make it easier.
Chemists do it periodically on table.

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