%0 Journal Article %J Journal of the American Chemical Society %D 1999 %T Study of xenon binding in cryptophane-A using laser-induced NMR polarization enhancement %A Luhmer, M. %A Goodson, B. M. %A Song, Y. Q. %A Laws, D. D. %A Kaiser, L. %A Cyrier, M. C. %A Pines, A. %K SPECTROSCOPY %X

In solution, spin-polarization transfer between laser-polarized xenon and the hydrogen nuclei of nearby molecules leads to signal enhancements in the resolved H-1 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 H-1 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 H-1 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.

%B Journal of the American Chemical Society %V 121 %P 3502-3512 %8 Apr 14 %@ 0002-7863 %G English %U ://WOS:000079884800033 %N 14 %M WOS:000079884800033 %! Study of xenon binding in cryptophane-A using laser-induced NMR polarization enhancement %R Doi 10.1021/Ja9841916 %0 Journal Article %J Chemical Physics Letters %D 1998 %T NMR of supercritical laser-polarized xenon %A Haake, M. %A Goodson, B. M. %A Laws, D. D. %A Brunner, E. %A Cyrier, M. C. %A Havlin, R. H. %A Pines, A. %K gas %X

The feasibility of producing supercritical laser-polarized xenon for nuclear magnetic resonance (NMR) investigations was studied. Using a high-pressure capillary tube, a supercritical xenon sample (52 degrees C, 65 atm) was produced with a Xe-129 polarization approximately 140 times the equilibrium value. The polarization was observed to last for hundreds of seconds, in agreement with previous studies. These preliminary results suggest that supercritical laser-polarized xenon may be used as a polarizing solvent for numerous NMR applications. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

%B Chemical Physics Letters %V 292 %P 686-690 %8 Aug 14 %@ 0009-2614 %G English %U ://WOS:000075482300049 %N 4-6 %M WOS:000075482300049 %! NMR of supercritical laser-polarized xenon %R Doi 10.1016/S0009-2614(98)00732-5