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The fluorooxoborate A2B6O9F2 family (A = alkali metal) has attracted much attention because of its diverse structures and properties. Herein, two new members of this family, (NH4)2B6O9F2 and K2B6O9F2, have… Click to show full abstract
The fluorooxoborate A2B6O9F2 family (A = alkali metal) has attracted much attention because of its diverse structures and properties. Herein, two new members of this family, (NH4)2B6O9F2 and K2B6O9F2, have been synthesized which exhibit different two-dimensional [B6O9F2]∞ layered structures. Millimeter-sized crystals of (NH4)2B6O9F2 have been grown with NH4F as the flux. The transmittance spectrum indicates that it has a wide UV transparency window with a cutoff edge lower than 180 nm. First-principles calculations show that both (NH4)2B6O9F2 and K2B6O9F2 have deep-UV cutoff edges and moderate birefringence. The contributions of the constituent structural groups to the optical properties are discussed.
Journal Title: Chemical communications
Year Published: 2022
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