AYSO 4 F 2 (A = K, Rb): [YO 4 F 4 ] Polyhedra Enhancement of Birefringence in Non-π-Conjugated Sulfate Systems.

A mild hydrothermal method was employed to successfully synthesize two new sulfate fluorides, namely, AYSO 4 F 2 (A = K, Rb). They are isomorphic, and both contain [YO 4 F 4 ] polyhedra and [SO 4 ] tetrahedra in the structure. Theoretical calculations and experimental tests show that AYSO 4 F 2 (A = K, Rb) have large band gaps (7.79 and 7.82 eV) and moderate birefringence (0.015 and 0.02 @ 546.1 nm), with significantly enhanced birefringence and band gaps as compared to that of the single alkali metal sulfates A 2 SO 4 (A = K, Rb). Furthermore, theoretical calculations show that [YO 4 F 4 ] polyhedra are the main reason for the band gap and birefringence enhancement. This work contributes to the advancement of structural chemistry in the field of rare-earth sulfates, offering a novel approach for the design of sulfates characterized by large birefringence.