Tweezers for parahydrogen: a metal-free probe of nonequilibrium nuclear spin states of H₂ molecules

Journal of the American Chemical Society
Vladimir V ZhivonitkoIgor V Koptyug

Abstract

To date, only metal-containing hydrogenation catalysts have been utilized for producing substantial NMR signal enhancements by means of parahydrogen-induced polarization (PHIP). Herein, we show that metal-free compounds known as molecular tweezers are useful in this respect. It is shown that ansa-aminoborane tweezers QCAT provided (20-30)-fold signal enhancements of parahydrogen-originating hydrogens in (1)H NMR spectra. Nuclear polarization transfer from the polarized hydrogens to (11)B nuclei leads to a 10-fold enhancement in the (11)B NMR spectrum. Moreover, our results indicate that dihydrogen activation by QCAT and CAT tweezers is carried out in a pairwise manner, and PHIP can be used for understanding the activation mechanism in metal-free catalytic systems in general.

References

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Citations

Aug 29, 2014·Journal of the American Chemical Society·Lauren E LongobardiDouglas W Stephan
Sep 26, 2017·Physical Chemistry Chemical Physics : PCCP·A N PravdivtsevH-M Vieth
Oct 7, 2016·Physical Chemistry Chemical Physics : PCCP·Vladimir V ZhivonitkoIgor Koptyug
Dec 9, 2017·Magnetic Resonance in Chemistry : MRC·Gaspard HuberPatrick Berthault
Jan 30, 2019·Physical Chemistry Chemical Physics : PCCP·Vladimir V ZhivonitkoIgor V Koptyug
Feb 1, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Dexin GuanSimon B Duckett
Sep 20, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Kai BuckenmaierAndrey N Pravdivtsev
Mar 17, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Vladimir V ZhivonitkoAxel Schulz
Feb 6, 2018·The Journal of Physical Chemistry Letters·Kristina SorochkinaIgor V Koptyug
Sep 15, 2017·Journal of the American Chemical Society·Kenan TokmicAlison R Fout
Oct 9, 2018·The Journal of Physical Chemistry. a·Andrey N PravdivtsevJan-Bernd Hövener
Sep 5, 2020·Progress in Nuclear Magnetic Resonance Spectroscopy·Patrick BerthaultGuillaume Carret

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