In:
The Journal of Chemical Physics, AIP Publishing, Vol. 119, No. 17 ( 2003-11-01), p. 9242-9250
Abstract:
An appreciable increase in spectral resolution in the H1 nuclear magnetic resonance (NMR) spectra of small organic molecules adsorbed in well-crystallized zeolites is obtained by the application of the magic angle spinning (MAS) technique, which allows to observe slight changes in the proton chemical shifts and to measure well-resolved two-dimensional (2D) NMR spectra. The behavior of 1-butene adsorbed in NaX zeolite is studied by analyzing proton chemical shifts at various temperatures and measuring intramolecular proton–proton distances by means of H1 NOESY NMR spectroscopy. Drastic changes in the NMR line shape of the protons belonging to the terminal group =CH2 are found at varying temperatures (230–340 K) and pore filling factors (between ∼0.05 and 4 molecules per large cavity). There is clear evidence that 1-butene molecules interacting with the exchangeable Na+ cations in NaX zeolites reveal a change in the conformation in comparison to those in the bulk phase.
Type of Medium:
Online Resource
ISSN:
0021-9606
,
1089-7690
Language:
English
Publisher:
AIP Publishing
Publication Date:
2003
detail.hit.zdb_id:
3113-6
detail.hit.zdb_id:
1473050-9
