Re: [AMMRL] Adding 40/60 D2O/d-sulfuric acid as a lock solvent?

From: Spin-Doc <bert.heise_at_spin-doc.net>
Date: Tue, 13 May 2025 18:44:54 +0800
Dear Wendy,

It would be quite important to know which kind of spectrometer you are using: Bruker/Varian/Jeol/BenchtopXY…?

For Varian/VnmrJ the files to modify are
/vnmr/solvents (essentially self-explaining - copy the two D2O lines and paste them as, for example, sulfuric_acid, change the ppm values accordingly & save)
/vnmr/solventlist (the file driving the dropdown menu, the first column is the label, for example “Sulfuric Acid” while the second is the value of the variable, here “sulfuric_acid”).

Lastly you should add two new line ms to the probefile (typically vnmrsys/probes/PROBENAME/PROBENAME) that again contains the lock gain and power values - both maybe some 3 dB higher than for D2O to compensate for the lower deuterium concentration.

In Topspin you can add a new solvent entry via “edlock”.

Best regards
Bert

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Am 13.05.2025 um 18:22 schrieb Wendy Breyer via groups.io:


Hello,
 
A user ran a reaction in a ~40/60 D2O/d-sulfuric acid mixture so that she could directly analyze her products via NMR.  However, when she used D2O as the lock solvent, she found her peaks shifted significantly (e.g. aromatic peaks at 2-3ppm).  We are thinking that we should add the 40/60 D2O/d-sulfuric acid mixture to our Solvents table.  Has anyone added a similar entry?  What signal values did you use? Or is there another way around this issue?
 
Thanks!
 
Wendy
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Received on Tue May 13 2025 - 04:37:42 MST

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