2 ETHYLENEDIAMINE-TEMPLATED ZEOLITE-TYPE STRUCTURES IN ZINC ARSENATE AND COBALT PHOSPHATE SYSTEMS

Hydrothermal syntheses and X-ray crystal structures of two zeolite-typ e structures encapsulating protonated ethylenediamine and consisting o f three-dimensional 8-ring channels are presented. UCSB-3 and ACP-3 ar e isostructural and have zeolite-type topologies. The framework consis ts of cross-linked bifurcated hexagonal-square (bhs) chains, similar t o that found in the zeolite-type structure, AlPO4-D. Alternatively, li ke a number of zeolite structures such as ABW, gismondine, merlinoite, and phillipsite, the framework can be considered as superimposed 4.8( 2) nets. UCSB-3 is the only amine-templated arsenate with a zeolite-ty pe topology. Crystal data for (H3NCH2CH2NH3)(0.5). ZnAsO4 (UCSB-3): M = 235.35, space group P4(2)/n, a = 10.7598(1) Angstrom, c = 9.1015(1) Angstrom, V = 1053.71(2) Angstrom(3), Z = 8, D-c = 2.967 g cm(-3), MoK alpha, lambda = 0.71073 Angstrom, mu = 10.815 mm(-1), 2 theta(max) = 56.26 degrees, R(F) = 2.67% for 84 parameters and 1262 reflections wit h I > 2 sigma(I). Crystal data for (H3NCH2CH2NH3)(0.5(1-x)). AlxCo1-xP O4 (x approximate to 0.15, ACP-3): space group P4(2)/n, a = 10.4236(1) Angstrom, c = 8.9487(1) Angstrom, V = 972.29(2) Angstrom 3, Z = 8, Mo K alpha, 2 theta(max) = 56.52 degrees, R(F) = 3.59% for 92 parameters and 1108 reflections with I > 2 sigma(I). (C) 1998 Academic Press.