Accession Number : ADA251371

Title :   Synthesis and Structure of Li8(HPO4)(BePO4)6.H20, A New Zeolite losod-type Beryllophosphate Molecular Sieve: Anion Templating with (HP04)2-.

Descriptive Note : Technical rept. 1 Jun 91-31 May 92,

Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY

Personal Author(s) : Harrison, William T. ; Gier, Thurman E. ; Stucky, Galen D.

Report Date : 15 MAY 1992

Pagination or Media Count : 31

Abstract : We report synthesis and single-crystal structure of Li8(HPO4)(BePO4)6-H2O (BePO-LOS) which is a topological equivalent of the synthetic low-sodium aluminosilicate zeolite losod, Na6(AlSiO4)6-9H2O (structure code: LOS). Crystal data for BePO-LOS: trigonal, space group P31c (No. 159), alpha + 11.504 (2) A, c = 9.273 (2) A V = 1062.8 cubic-A, Z = 2.R = 4.63%, R sub w = 4.88% for 1053 observed reflections with I . 3o(I). Refined framework-atom bond distances D SUB AVE(Be-O) = 1.624 (4) A, d sub ave(P-O) = 1.531 (2) A reflect the fully-ordered distribution of Be and P-atoms over the framework tetrahedral nodes. The extra-framework lithium cations are in typical tetrahedral geometry (3 framework oxygen atomis + 1 extra framework oxygen atom), while the included hydrogen phosphate anion, coordinated by lithium cations within the loso-cage, is novel. The structure of BePO-LOS is considered in relationship to other BePO sieves characterized recently.

Descriptors :   *SYNTHESIS(CHEMISTRY), *MOLECULAR SIEVES, BERYLLIUM, PHOSPHORUS, LITHIUM.

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE