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Study of xenon binding in cryptophane-A using laser-induced NMR polarization enhancement

par Luhmer, Michel ;Goodson, B.M.;Song, Y.-Q.;Laws, D.D.;Kaiser, Laurent;Cyrier, M.C.;Pines, Alexander
Référence Journal of the American Chemical Society, 121, 14, page (3502-3512)
Publication Publié, 1999

Article révisé par les pairs

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Résumé :

In solution, spin-polarization transfer between laser-polarized xenon and the hydrogen nuclei of nearby molecules leads to signal enhancements in the resolved 1H NMR spectrum, offering new opportunities for probing the chemical environment of xenon atoms. Following binding of laser-polarized xenon to molecules of cryptophane-A, selective enhancements of the 1H NMR signals were observed. A theoretical framework for the interpretation of such experimental results is provided, and the spin polarization-induced nuclear Overhauser effects are shown to yield information about the molecular environment of xenon. The observed selective 1H enhancements allowed xenon- proton internuclear distances to be estimated. These distances reveal structural characteristics of the complex, including the preferred molecular conformations adopted by cryptophane-A upon binding of xenon.