A 69Ga and 71Ga MAS NMR study of the gallium analogue zeolite ZSM-5
69Ga and 71Ga magic-angle-spinning (MAS) NMR spectra of a series of gallium analogue zeolites H—(Ga)ZSM-5, with varying Si/Ga ratios, were obtained at 14.1 and 7.1 T. The quadrupole coupling constant e 2qQ/h was deduced from the shift difference of the centre of gravity of the 69Ga and 71Ga resonanc...
Saved in:
Published in | Chemical physics letters Vol. 176; no. 3; pp. 399 - 403 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
1991
Elsevier Science |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 69Ga and
71Ga magic-angle-spinning (MAS) NMR spectra of a series of gallium analogue zeolites H—(Ga)ZSM-5, with varying Si/Ga ratios, were obtained at 14.1 and 7.1 T. The quadrupole coupling constant
e
2qQ/h
was deduced from the shift difference of the centre of gravity of the
69Ga and
71Ga resonance. An analysis of the linewidth as a function of the magnetic field shows that the width is not only determined by the second-order quadrupolar broadening, but also by a distribution of chemical shifts. The values obtained for the quadrupole coupling constant and chemical shift distribution are compared to those found for
27Al in H—(Al)ZSM-5. It is argued that the observed differences are related to the different NMR properties of the isotopes, and do not point to any structural changes of the ZSM-5 lattice. |
---|---|
ISSN: | 0009-2614 1873-4448 |
DOI: | 10.1016/0009-2614(91)90051-A |