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Topic: Is there any atoms that do not couple even if they are magnetically inequivalent  (Read 738 times)

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Offline AussieKenDoll

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Is there any atoms that do not couple even if they are magnetically inequivalent
« on: August 21, 2020, 12:33:25 PM »
Does I and F couple in F-19 NMR? If not why?
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Offline Babcock_Hall

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Re: Is there any atoms that do not couple even if they are magnetically inequivalent
« Reply #1 on: August 21, 2020, 04:11:19 PM »
I don't know the specific answer to your question.  But let me offer you food for thought.  Do we observe Cl-35 coupling to H-1 or to C-13 in chloroform?
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Offline AussieKenDoll

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Re: Is there any atoms that do not couple even if they are magnetically inequivalent
« Reply #2 on: August 21, 2020, 04:21:53 PM »
no because C-13 and H-1 are not quadroupole active?
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Offline Babcock_Hall

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Re: Is there any atoms that do not couple even if they are magnetically inequivalent
« Reply #3 on: August 22, 2020, 09:48:26 AM »
C-13 and H-1 couple to H-2, which is quadrupolar; therefore, we know that in general spin-1/2 nuclei can couple with quadrupolar nuclei.  I think it has to do with the relaxation rate of the Cl-35 nucleus being very fast.  It has been some time since I looked into this over.
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