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Topic: Quality Sample can Impact on Multiplicity?  (Read 679 times)

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Offline brunnoraawr

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Quality Sample can Impact on Multiplicity?
« on: October 27, 2023, 08:51:09 PM »
Hello, I did one reaction but the product appears to be very insoluble in organic solvents.
I did one sample to send to NMR, the quality of the signal is very poor and I coulnd't even make a ¹³C spectrum because the poor quality

The problem is, I would see duplets, but I only see thin singlets, is it possible that the quality is so poor that I can't see the real multiplicty? I did one COSY and I saw correlations between these singlets, so I think is very strange one singlet be coupled with other singlet with J3.

What do you guys think?

Offline rolnor

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Re: Quality Sample can Impact on Multiplicity?
« Reply #1 on: October 28, 2023, 05:00:40 AM »

Have you tried DMSO-d6? You can heat the sample too.

Offline brunnoraawr

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Re: Quality Sample can Impact on Multiplicity?
« Reply #2 on: October 28, 2023, 10:53:34 AM »

Have you tried DMSO-d6? You can heat the sample too.

Hello, I tried in DMSO, the signal became thinner, but it also contains a singlet, I aspected to see a doublet, so I don't know if I didn't get my product or if It can be because of the sample quality impact on the multiplicity.

Have you ever heard something about it?

Offline Babcock_Hall

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Re: Quality Sample can Impact on Multiplicity?
« Reply #3 on: October 28, 2023, 01:02:20 PM »
If the lines were unusually broad, a doublet would give the appearance of being a broad singlet.  That might happen if there were a paramagnetic ion present.  This is just a conjecture.

Offline rolnor

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Re: Quality Sample can Impact on Multiplicity?
« Reply #4 on: November 03, 2023, 10:14:01 PM »
Can you show us what you did, the chemistry?

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