Dear all,
A faster way to deal with traces of acid is plug a Pasteur pipette with some
tissue (can be packed fairly tight for CDCl3) and then add some Na2CO3
(0.5-1 cm is usually sufficient) and then allow the CDCl3 solution to percolate
through directly into the NMR tube. The residual amount of non-absorbed CDCl3
solution retained in the Na2CO3 bed and tissue can be pushed through by
applying some gentle pressure with a pipette bulb (hence it helps to have
the tissue packed in nice and tight to retain the Na2CO3), or simply use
more CDCl3.
Regards,
Karel
________________________________________
> From: main_at_ammrl.groups.io on behalf of Platz Hirsch
> Sent: 24 April 2024 10:44:22
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Silver Strips in CDCl3?
Hello,
that’s no direct answer concerning your question.
If you have really sensitive samples, the best way is to add a tiny amount
silver oxide directly into the NMR tube.
You might be interested to check out the effect.
Take CDCl3 as a solvent and add a drop of methanol. You should see two singlets,
one for the methyl, one for The OH group. Now add a few micrograms of silver
oxide. You have to shake it a rather long time. Long time means At least one hour.
An ultrasonic bath should do the job.
Insert the sample immediately into the spectrometer to keep light away and wait
a few minutes to allow the silver Oxide to move to the bottom of the tube.
And then measure again. You should see the expected doublet for the
Methyl and a quartet for the OH group.
Greetings
Rainer
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Received on Fri Apr 26 2024 - 17:20:58 MST