Amine-templated syntheses and crystal structures of zeolite rho analogs

Hydrothermal syntheses and single-crystal structures of three zeolite rho analogs with novel framework compositions are presented. The incorporation of divalent metal atoms (Co2+, Mn2+ and Mg2+) into the framework metal-atom sites is directly and unambiguously established from single-crystal diffraction data. MnAP-RHO1 and MAP-RHO1 have the highest Mn2+ or Mg2+ substitution levels in aluminophosphate-based structures, respectively. These analogs are prepared using the amine-templated synthesis approach, and the organic amine uniquely templates the formation of the zeolite rho topology. The amine molecule is not located at the center of the large alpha-cage, but is instead positioned at the center of each double eight-ring. (C) 1998 Elsevier Science B.V. All rights reserved.