Study of the Aluminophosphates A1P04-21 and AlP04-25 by 27Al Double-Rotation NMR

R. Jelinek, B. F. Chmelka, Y. Wu, P. J. Grandinetti, A. Pines, P. J. Barrie, J. Klinowsk

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


Aluminum-27 double-rotation NMR in a magnetic field of 11.7? distinguishes the extremely distorted five-coordinated aluminum sites in the molecular sieve precursor A1P04-21. Upon calcination, A1P04-21 transforms to AlP04-25, which has two tetrahedral aluminum sites with similar isotropic chemical shifts that cannot be resolved in an 11.7? field. The two tetrahedral environments, however, have different quadrupole coupling constants and are distinguished by double rotation at 4.2? field. The quadrupole coupling constants obtained for these sites indicate that the tetrahedral aluminum environments are less distorted in the hydrated material.

Original languageEnglish
Pages (from-to)4097-4101
Number of pages5
JournalJournal of the American Chemical Society
Issue number11
StatePublished - 1 May 1991
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry (all)
  • Biochemistry
  • Colloid and Surface Chemistry


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