Cs[B 3 O 3 F 2 (OH) 2 ]: discovery of a hydroxyfluorooxoborate guided by selective organic-inorganic transformation.

Selective transformation between organic and inorganic systems is crucial but still remains a challenge. Herein, we demonstrated that selective organic-inorganic transformation is a simple but effective strategy to find new hydroxyfluorooxoborates. By replacing the [Ph 4 P]/[Ph 3 MeP] organic cations with Cs atoms, a new hydroxyfluorooxoborate Cs[B 3 O 3 F 2 (OH) 2 ] with three-membered [B 3 O 3 F 2 (OH) 2 ] clusters was synthesized. Theoretical analysis confirmed the effects of different components in the lattice of reported structure on the optical properties.