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A Porous Crystalline Molecular Solid Explored by Hyperpolarized Xenon
Author(s) -
Sozzani Piero,
Comotti Angiolina,
Simonutti Roberto,
Meersmann Thomas,
Logan John W.,
Pines Alexander
Publication year - 2000
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20000804)39:15<2695::aid-anie2695>3.0.co;2-m
Subject(s) - xenon , anisotropy , isotopes of xenon , molecule , noble gas , chemical physics , nuclear magnetic resonance spectroscopy , hyperpolarization (physics) , materials science , chemistry , nuclear magnetic resonance , crystallography , optics , physics , stereochemistry , organic chemistry
Volatile species and large gas atoms , such as xenon, can diffuse into the aromatic nanochannels of a solid comprising tris( o ‐phenylenedioxy)cyclophosphazene molecules held together by weak interactions. Continuous‐flow laser‐polarized 129 Xe NMR spectroscopy shows an anisotropic signal from the xenon atoms inside the crystals as soon as 200 ms after contact of the polarized gas with the sample. The xenon chemical shift anisotropy is concentration dependent (see picture) and undergoes a sign inversion as a result of the change of the symmetry of electron cloud.