BaAlPO4F2：Structure and Properties of the First Barium Fluoroaluminophosphate with Mixed Anion Group [Al2PO8F5]

The mixed-anionic compounds are attractive hunting grounds for probing optical crystals due to their interesting physiochemical properties. Herein, the first barium fluoroaluminophosphate, BaAlPO4F2, was synthesized by high temperature reactions in the closed system for the first time. In the structure, the PO4 group bonds with [Al2O6F5] dimers to form the unusual [Al2PO5F4]∞ 2D layers and the Ba2+ cations reside in the interlayer space. This paper discusses the flexibility and diversity of the assembly s