Hi All,
I have just gotten around to summarizing all the replies about suggesting
setup compounds
for solid-state 19F NMR. Thanks for everyone's help.
Joe S.
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Try sodium trifluoroacetate. It's a good standard for single pulse or
CP, and it's dirt cheap. I recommend anhydrous rather than trihydrate.
Try Teflon tape. I use it frequently for 19F Chem Shift reference (-121ppm)
and 19F-to-13C CPMAS setup.
If you want to do all combinations of H,F,C with and without various CP and
decoupling modes, you can use poly-vinylidene difluoride [-CH2CF2-], which
is available from Sigma-Aldrich.
For standards to set up experiments I have used C6F6 (0 ppm), which is a
liquid, but it can be put into a shortened 5 mm solution NMR tube and placed
into the coil. This sample works very well for getting on resonance and
finding a 90 degree pulse. A solid standard we routinely use is
Fluoroapatite (64 ppm), which is the fluorinated analog of hydroxyapatite
Received on Wed Jul 14 2004 - 17:05:08 MST