Two Aluminophosphate Molecular Sieves Built from Pairs of Enantiomeric Structural Building Units

Abstract Herein we report the synthesis and structures of two new small‐pore aluminophosphate molecular sieves PST‐13 and PST‐14 with mutually connected 8‐ring channels. The structure of PST‐13, synthesized using diethylamine as an organic structure‐directing agent, contains penta‐coordinated framework Al atoms bridged by hydroxy groups and thus edge‐sharing 3‐ and 5‐rings. Upon calcination, PST‐13 undergoes a transformation to PST‐14 with loss of bridging hydroxy groups and occluded organic species. The structures of both materials consist “nonjointly” of pairs of previously undiscovered 1,5‐ and 1,6‐open double 4‐rings ( d4r s) which are mirror images of each other. We also present a series of novel chemically feasible hypothetical structures built from 1‐open d4r ( sti ) or 1,3‐open d4r ( nsc ) units, as well as from these two enantiomeric structural building units.