CHEMICAL SHIFT DISPERSION DUE TO CRYSTALLOGRAPHIC INEQUIVALENCE AND IMPLICATIONS REGARDING THE INTERPRETATION OF THE HIGH-RESOLUTION 29Si MAS NMR SPECTRA OF ZEOLITES

Autor: Fyfe, C A, Gobbi, G C, Kennedy, G J, Schutter, C T De, Murphy, W J, Ozubko, R S, Slack, D A
Zdroj: Chemistry Letters; February 1984, Vol. 13 Issue: 2 p163-166, 4p
Abstrakt: The 29Si MAS NMR spectra of dealuminated zeolites have been studied, where the chemical shift dispersion due to structurally distinct SiO4, tetrahedra is comparable (or greater) in magnitude to first coordination sphere effects. The results 29Si suggest that some previous Si peak assignments are incorrect and that a detailed interpretation of some zeolite spectra is complex.
Databáze: Supplemental Index