RE: Removing Background signal for Si-29 NMR

From: Hsin Wang <wang_at_mail.csi.cuny.edu>
Date: Fri, 20 Aug 2004 14:35:31 -0400

I have not used PTFE-FEP tube myself. But it would seem useful for this
purpose. Both Wilmad and Norell sell it. Here is some description from
Wilmad's catalogue (p.72):

For 29Si studies, the teflon tube liners can be inserted into an NMR sample
tube where the bottom 50-60mm of the sample tube has been removed. (They
said you can see their Resonance Report NMR-012 online at
www.wilmad-labglass.com)

Hsin

--
Hsin Wang, Ph.D.
NMR Facility Manager
College of Staten Island
2800 Victory Boulevard
Staten Island, NY 10314
Phone: 718-982-3809
Fax: 718-982-3910
Email: wang_at_mail.csi.cuny.edu
  -----Original Message-----
  From: schraml_at_icpf.cas.cz [mailto:schraml_at_icpf.cas.cz]
  Sent: Thursday, August 19, 2004 3:58 AM
  To: ammrl_at_ammrl.org
  Subject: RE: Removing Background signal for Si-29 NMR
  The solution suggested by Pichumani Kumar is good if you have couplings to
employ for polarization transfer though the optimization of the delays is a
not trivial task depending on the number of coupled and equivalent
protons.(See Blechta V., Schraml J.: Product operator formalism applied to
large spin systems (INEPT and DEPT examples).   J. Magn. Reson. 69, 293
(1986).
  and references therein)
  If you cannot use polarization transfer and your spectral lines are narrow
(relative to the quartz line) use spin-echo to suppress the broad line.
  If the lines you are interested in are also broad, you have to resort to
subtracting the signal of the tube (and probe!!!) recorded in a separate
measurements.
  Sincerely,
   Jan Schraml
----------------------------------------------------------------------------
--
  > From: Fauzi Mohd Som, Dr [mailto:fauzi_at_lgm.gov.my]
  > Sent: Wednesday, August 18, 2004 10:44 AM
  > To: ammrl_at_ammrl.org
  > Subject: Removing Background signal for Si-29 NMR
  I wonder if anyone can provide me a suggestion on how to remove the
background signal of the quartz NMR tube when I do Si-29 liquid state NMR.
  Best regards,
  Fauzi Mohd Som (Dr.)
  Malaysian Rubber Board
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Received on Fri Aug 20 2004 - 14:28:37 MST