[AMMRL] Unexpected peaks of 19F NMR from CF3CH2OH

From: Weidong Hu via groups.io <whu=coh.org_at_groups.io>
Date: Wed, 12 Jul 2023 17:33:28 +0000

Hi All,

I acquired 1D-19F NMR of CF3CH2OH dissolved in CDCl3/CD3OD(2:1 v/v) on CP TCI
700 H&F-C/N-D probe (without 1H decoupling), and the spectrum is very confusing.

In addition to main triplet peaks, there are three minor triplet peaks (about
0.5% of main triplet). The positions of minor peaks are not symmetric to the
main triplet, and thus should not come from natural abundance of 13C-19F J coupling.
It is reasonable to see four minor peaks generated from one and two-bond J couplings
between 13C-19F, but they should be symmetric to the main peak. I don't know how to
explain the observed spectrum. Any suggestions as what is going on? The spectrum is
attached below.

Thank you,

Weidong

Dr. Weidong Hu
Department of Immunology & Theranostics
Beckman Research Institute
1450 E. Duarte Rd., Duarte, CA 91010
Tel: 626 256 4673, Ext: 63416
Fax: 626 301 8186

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Received on Wed Jul 12 2023 - 10:54:04 MST