Hi Weidong,
No, the satellite peaks are not expected to be symmetric with respect to the
central peak. Pronounced (one bond and two bond) isotope effects will shift
the center of the doublets to higher field. The missing fourth triplet is
probably hidden beneath the central peak.
Best regards,
Marc-Olivier
ETH Zurich
Dr. Marc-Olivier Ebert
Laboratory of Organic Chemistry
Vladimir-Prelog-Weg 3
8093 Zurich
Switzerland
Tel. +41 44 633 47 26
Fax. +41 44 632 14 75
Am 12.07.2023 um 19:33 schrieb Weidong Hu via groups.io <whu=coh.org_at_groups.io>:
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 - 14:30:10 MST