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Pulsed Field Gradient ‘Inverse’ HOESY Applied to the Isotope Pairs 1H,31P and 1H,7Li*

✍ Scribed by Walter Bauer

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 603 KB
Volume: 34
Category: Article
ISSN: 0749-1581
DOI: 10.1002/(sici)1097-458x(199607)34:7<532::aid-omr910>3.0.co;2-c

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✦ Synopsis

For many heteronuclei, inverse ('H detected) heteronuclear Overhauser effect spectroscopy (HOESY) should be superior in theory over heteronucleus detected HOESY. In practice, strong t, noise artifacts completely cancel the benefits of inverse HOESY. However, pulsed field gradient (PFG)-enhanced inverse HOESY yields 2D spectra without any t, noise, consisting only of genuine cross peaks. The applicability of the method is demonstrated for thymolphthalein monophosphate hydrate using 31P,1H PFG-HOESY and for n-butyllithium using 'Li,'H PFG-HOESY. In addition to the absence oft, noise, the merit of PFG-inverse HOESY is improved digital resolution in the usually crowded 'H domain.

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## Abstract ^7^Li, ^31^P, and ^1^H variable‐temperature pulsed gradient spin‐echo (PGSE) diffusion methods have been used to study ion pairing and aggregation states for a range of lithium salts such as lithium halides, lithium carbanions, and a lithium amide in THF solutions. For trityllithium (**