Tetrafluoroborate-Monofluorophosphate (NH 4 ) 3 [PO 3 F][BF 4 ]: First Member of Oxyfluoride with B-F and P-F Bonds.

Inspired by the strategy of fluorine introduction in borates and phosphates, the inorganic oxyfluoride (NH 4 ) 3 [PO 3 F][BF 4 ] with B-F and P-F bonds has been characterized as the first fluoroborate-fluorophosphate. The International Union of Pure and Applied Chemistry (IUPAC) name for (NH 4 ) 3 [PO 3 F][BF 4 ] should be ammonium tetrafluoroborate-monofluorophosphate according to the structure characteristics. The existence and coordination of fluorine in (NH 4 ) 3 [PO 3 F][BF 4 ] were confirmed by several approaches, including single-crystal structure analysis; bond valence analysis; and X-ray energy dispersive, infrared spectrum, and also nuclear magnetic resonance spectroscopy. This work is of great significance to enrich the solid-state chemistry of borates and phosphates and also open a new branch of mixed anion compound with fluoroborate-fluorophosphates.