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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: tombarret on April 19, 2022, 11:04:54 AM

Title: Why does my amide N-H peak show as a sharp doublet?
Post by: tombarret on April 19, 2022, 11:04:54 AM

Here is an NMR of the shown molecule. The peak on the very left at 7.42 is the N-H peak in the amide bond.
Can someone explain why this appears so sharply and well defined also why is it a doublet?
Thank you!

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Title: Re: Why does my amide N-H peak show as a sharp doublet?
Post by: Babcock_Hall on April 19, 2022, 12:28:34 PM

Do you have a vicinal hydrogen atom?

Title: Re: Why does my amide N-H peak show as a sharp doublet?
Post by: Orcio_87 on April 20, 2022, 10:24:23 AM

As of peak sharpness - I heard it is correlated with the rate of H at N-H exchange. As of doublet - adjacent H atom splits the signal into two.