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- Title
Squeezing xenon into phenylether bis-urea nanochannels.
- Authors
Bowers, Clifford R.; Dvoyashkin, Muslim; Salpage, Sahan R.; Akel, Christopher; Bhase, Hrishi; Geer, Michael F.; Shimizu, Linda S.
- Abstract
One-dimensional nanochannels, hundreds of microns in persistence length but with elliptical cross-sectional dimensions of only ~3.7 Å × 4.8 Å, are formed by the columnar assembly of phenylether bis-urea macrocycles. Hyperpolarized Xe-129 NMR is utilized to investigate the Xe atom packing and Xe diffusion inside the needle shaped crystals. The elliptical channel structure produces a Xe-129 powder pattern characteristic of an asymmetric chemical shift tensor extending to well over 300 ppm with respect to the gas phase, reflecting the highly anisotropic electronic environment and extreme confinement of the atom. Consistent with the simple geometrical criterion, hyperpolarized tracer exchange NMR data reveals single-file diffusion in the bis-urea nanochannels.
- Subjects
XENON; PHENYL ethers; MACROCYCLIC compounds; CRYSTAL structure; DIFFUSION
- Publication
Canadian Journal of Chemistry, 2015, Vol 93, Issue 9, p1031
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2015-0152