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Accurate determination of small nuclear magnetic resonance coupling constants from decoupling experiments

Content Provider	Royal Society of Chemistry (RSC)
Author	Portilla, Federico del Río Freeman, Ray
Copyright Year	1993
Abstract	A new technique is described for the accurate determination of small NMR spin coupling constants. The multiplet under investigation is recorded under coupled and decoupled conditions, and then corresponding ordinates of the time-domain signals are divided, leaving only the modulation term, cosn(πJISt) where n is the number of equivalent protons in the irradiated group. Precautions are taken to avoid division by zero or near-zero values. The Fourier transform of the quotient is a single multiplet (1 : 1 doublet, 1 : 2 : 1 triplet, or 1 : 3 : 3 : 1 quartet) giving a direct measure of the coupling constant. The technique is illustrated with reference to the proton–proton couplings in furan-2-aldehyde in various solvents. The reproducibility of the measurements is superior to ±0.04 Hz and the results are in good agreement with those from a related technique where the decoupled multiplet is reconvoluted with a trial coupling J* which is varied to give best fit with the fully coupled multiplet.
Starting Page	4275
Ending Page	4278
Page Count	4
File Format	PDF
ISSN	09565000
Volume Number	89
Issue Number	24
Journal	Journal of the Chemical Society, Faraday Transactions
DOI	10.1039/FT9938904275
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Furan Quartet Fourier transform Nuclear magnetic resonance spectroscopy Nuclear magnetic resonance The Technique Aldehyde J-coupling
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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