Dear Muhammad,
Concerning issue 2: you have a septet, the outer signals are just in the noise.
On the right sight you can even assume this peak. You need to measure longer
or use another method: INEPT or DEPT without decoupling, or H,Si-HSQC without
the 180° proton pulse during the evolution time of the silicon (and
sufficient resolution in F1).
Best regards,
Sebastian
Von: main_at_ammrl.groups.io <main_at_ammrl.groups.io> Im Auftrag von Muhammad Adil Raees via groups.io
Gesendet: Dienstag, 14. Mai 2024 09:26
An: main_at_ammrl.groups.io
Betreff: [AMMRL] Assistance Needed: 29Si Experiment Issues #Bruker
Hello everyone,
We recently conducted a 29Si experiment on our system and encountered two
issues. We would appreciate your advice on these matters.
Issue 1: I was able to tune and match the probe with ATMM as shown in the
attached picture. I stored the values by clicking on the close and store
values box. However, when I tried to perform ATMA, I was directed to
optimize from ATMM again. A message box popped up on the screen, as attached
in this email. I am wondering how to store the wobble curve so that ATMA can
adjust it itself.
Issue 2: The researcher expected a heptate from 29Si at around 188ppm, but
I only detected a pentate. The signal is clear, but the outermost signals
didn't appear. I am wondering what parameters I should focus on to improve
the result. Do you think an inaccurate 90-degree pulse could be the cause?
Kind regards,
--
Muhammad Adil Raees, Ph.D.
Manager NMR Facility
The Central Laboratory
Syed Babar Ali School of Sciences and Engineering
Lahore University of Management Sciences
Opposite Sector-U, D.H.A. 54792, Lahore
+92-330-2866755
adil.raees_at_lums.edu.pk<mailto:adil.raees_at_lums.edu.pk>
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Received on Tue May 14 2024 - 05:11:44 MST