From K[Znbp2o8] To K[(Zn0.5al0.5)(2)P2o8]: Substitution-Induced Microporous Zincoaluminophosphate With A Congruent-Melting Behavior

An open-frame aluminophosphate, K[(Zn0.5Al0.5)(2)P2O8] (KZAPO), was rationally designed by a substitution design strategy and synthesized by a high-temperature molten salt method. Compared with the parent crystal of K[ZnBP2O8], KZAPO was characterized by similar 4 x 8 x 8 networks, a comparable short-wave ultraviolet transparency and a more regular tetrahedral frame with the mixing of (ZnO4)(6-) and (AlO4)(5-) anionic groups, highlighting the multifunctional roles that anionic group mixing played in structural and property modulations. In particular, KZAPO was characterized by a high thermal stability (over 850 degrees C) and a congruent-melting behavior, being conducive to practical applications.