more peaks than wanted

Charles Anderson (shiulong@bayou.uh.edu)
Wed, 17 Sep 1997 10:01:02 -0500 (CDT)

I thought I would throw this out to the NMR community since I don't have
the foggest idea what is going on.

We have a group here that is working on poly-pyridine ring systems.
Periodically they will run a C-13 and obtain 2 or 3 additional resonances
in the aromatic region. It would appear that the decoupler is not working
but that is not the case. I know this because the surrounding peaks are
decoupled and the resolution doesn't match what the J(C-H) should be.
These additional peaks do not always appear from run to run on the same
compound. But once they appear they don't go away so the are real
resonances.

If anyone has an idea I am open to suggestions. It would save more than a
few graduate students time and effort if we could solve this problem.

Thanks

Chuck

Charles L. Anderson, Ph.D.
Manager of NMR Facilities
Department of Chemistry
Fleming Building Room-302
University of Houston
Houston, TX 77204-5641

"Anything one man can imagine others can make true"
Jules Verne