Talk:Proton nuclear magnetic resonance

Fair use rationale for Image:NMR table.JPG

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BetacommandBot (talk) 23:28, 2 January 2008 (UTC)

Vanillin is a horrible compound for an example of NMR because protons D and E are identical chemical shifts, yet different environments. A different example should be used. —Preceding unsigned comment added by 99.250.22.193 (talk) 00:25, 3 June 2008 (UTC)

The vanillin spectrum picture was deleted from Wikimedia because of questionable copyright status. I inserted two H-1 NMR spectra images into this article, one of menthols in the introduction and one of ethyl acetate further down. H Padleckas (talk) 03:10, 25 January 2012 (UTC)

Please clarify a paragraph

I'm having a hard time figuring out what is meant by this sentence (found in the "Spin-spin couplings" section):

The peak in the spectrum would be split into ten lines according to the (n + 1) rule of multiplicity.

Where did the number "ten" come from, and what is a "line" in this context? What is the "(n+1) rule of multiplicity"?

--68.20.214.52 (talk) 04:51, 17 July 2008 (UTC)

I just added a sentence below the pascal's triangle that clarifies. Or at least explains more:) DMacks (talk) 05:15, 17 July 2008 (UTC)

That clarifies a bit (though I have since read it elsewhere). I still take issue with the use of the word "line". Now that I've done further reading elsewhere, I understand how it is used, but in the context of this article, it is not explained that each "sub-peak" is referred to as a line. When I first read the article, it didn't make sense to me. --68.20.214.52 (talk) 16:56, 18 July 2008 (UTC)

I made a small additional change. The rest of the article uses "peaks" to describe the individual lines of a multiplet, and the sentence under discussion used "lines". I changed it to "peaks". I think most NMR spectroscopists (in fact all types of spectroscopists who observe sharp absorptions) use "lines" in this context, but to do so here would require switching to "lines" throughout the article. I also added a bit on when the simple first-order rules outlined in the section fail. There should probably be much more here, considering the importance of NMR spectroscopy in chemistry. May tackle it sometime, and also add some better spectra (I have plenty that are not copyright restricted).ChemistHans (talk) 19:02, 21 July 2008 (UTC)

Incorrect info!

Can someone please clarify the "satellites are always caused by 13C nuclei" part - a blatant untruth! Nessa Carson (talk) 15:43, 22 May 2011 (UTC)

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The table of functional groups

Can someone add a clarifying caption or something to the table? Raccoonery (talk) 17:14, 23 January 2024 (UTC)