Birefringent crystals can manipulate the phase and polarization of light, and are therefore widely used as key components in various optical devices. In this study, the hydrogen-bonding interactions between the [C8H6FN2O]+ donor and the anionic acceptors, namely [SiF6]2- and Cl-, were utilized to achieve a high degree of coplanarity during crystal packing. The as-grown (C8H6FN2O)2</