Beryllium Diammine Difluoride [BeF2(NH3)2]

Beryllium difluoride BeF2 reacts with liquid ammonia forming discrete diammine difluoro beryllium( II) [BeF2(NH3)2] molecules. The colorless compound crystallizes in the monoclinic space group P21/c with a = 4.8815(2), b = 6.8528(3), c = 10.3690(5) Å, β = 92.01(1)◦, V = 346.65(3) Å3 at 123 K with Z = 4. [BeF2(NH3)2] is the first structurally characterized example of a berylliumammonia complex. The compound has been investigated further by Raman, IR, and DTA-TG measurements and by quantum chemical ELF, AIM and NBO calculations.