A Cationic Cesium Continuum in Zeolite X

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Science  22 Jan 1993:
Vol. 259, Issue 5094, pp. 495-497
DOI: 10.1126/science.259.5094.495


A cesium continuum that fills the channels and cavities of zeolite X has been prepared, and its structure has been determined by single-crystal x-ray crystallography. The three-dimensional continuum is cationic to balance the negative charge of the zeolite framework. Its valence electrons, only 0.3 per Cs+ ion, are widely delocalized over 95 percent of the cesium ions in the crystal. The continuum has a unit cell formula of (Cs122)86+ and contains Cs13 and Cs14 clusters (one per supercage) arranged like the atoms in diamond, with one Cs2 appendix (in the sodalite cavity) per cluster.