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Abstract
Abstract A single pink crystal of zeolite Na 78 Rb 28 -X(approximate composition) was prepared by exposing Na 92 -X at 350 0 C to 0.1 Torr of rubidium vapor, and its structure was determined by single-crystal x-ray diffraction methods in the cubic space group, Fd3, a = 25.045(4) A. Only about 28 of the 92 Na + ions per unit cell were reduced and only about 14 of the 28 Na 0 atoms produced were retained within the zeolite. A Na 5 s 4+ cluster is present within each sodalite cavity. It is a centered tetrahedron(like CH 4 ) with bond length = 2.80(2) A and angle tetrahedral by symmetry, and shows the full symmetry of its site, Td, at the center of the sodalite cavity. Each of the four terminal atoms of the Na 5 s 4+ cluster bond to three framework oxygens at 2.36(2) A. At the centers of some double 6-rings are sodium atoms which bridge linearly between Na 5 4+ , clusters to form agglomerations such as short zig-zag chains of Na 5 4+ clusters. Delocalized electrons, located primarily on the sodiums at the centers of the sodalite and(likely) double-six-ring cavities, contribute to the stability of the clusters.
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