On the polarizability of molecular sieves: 129Xe NMR chemical shifts and sorption energetics
β Scribed by Eric G. Derouane; Mark E. Davis
- Publisher
- Elsevier Science
- Year
- 1988
- Weight
- 327 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0304-5102
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π SIMILAR VOLUMES
experiments we have determined values of the mean free path 1 of xenon adsorbed on various zeolites. We deduce from them the dependence of the chemical shift S on 1. It is now possible to determine the dimensions of any cavity in which xenon can be adsorbed.
The adsorption isotherms and lz9Xe NMR chemical shifts of xenon in the voids of zeolite Y with O%, 53%, 75%, and 95% exchange of copper (II) for sodium ions were determined. With increasing copper content the shifts go uptield. The local chemical shifts of xenon at a crystallographic SII site with a
The dependence of the 129Xe NMR chemical shift value of XeF2 on temperature and concentration was determined in a variety of prototypic media: in acidic (anhydrous HF, aHF), nonprotic but polar (dichloromethane), and basic (CD3CN-EtCN, 1:3 v/v) solvents. The 129Xe NMR spectra of a representative ser