Multinuclear magic-angle spinning and double-rotation NMR study of the synthesis and assembly of a sodalite semiconductor supralattice

R. Jelinek, B. F. Chmelka, A. Stein, G. A. Ozin

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19 Scopus citations

Abstract

29Si magic-angle spinning, 27Al and 23Na magic-angle spinning, and double rotation NMR provide structural and electronic details for the newly developed sodalite semiconductor quantum supralattices. The evolution of the nucleation and crystallization processes of sodium halide sodalites is monitored, and the appearance of anion-empty sodalite cages is detected. Subtle changes in the electronic and quadrupolar interactions of sodium and aluminum nuclei occur upon loading chloride, bromide, and iodide into the sodalite cages. The NMR results suggest that the development of electronic coupling occurs throughout the lattice in mixed-halide chloro.iodosodalites. A preference for silver exchange of sodium cations in halide-containing cages, over hydroxide-containing and anion-empty sodalite cavities, is detected. Extraction of the isotropic chemical shift and quadrupolar contributions to the sodium resonances is achieved by performing the NMR experiments at two magnetic field strengths. The parameters obtained indicate a change in the charge distribution around the sodium nuclei upon exchanging approximately one-quarter of the extraframework Na+ cations with silver, which parallels other data pointing to the onset of a semiconductor supralattice within the sodalite matrix.

Original languageEnglish (US)
Pages (from-to)6744-6752
Number of pages9
JournalJournal of Physical Chemistry
Volume96
Issue number16
DOIs
StatePublished - Jan 1 1992

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