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Beryllium difluoride BeF 2  reacts with liquid ammonia forming discrete diammine difluoro beryllium( II) [BeF 2 (NH 3 ) 2 ] molecules. The colorless compound crystallizes in the monoclinic space group P2 1 /c with a = 4.8815(2), b = 6.8528(3), c = 10.3690(5) Å, β = 92.01(1)◦, V = 346.65(3) Å 3  at 123 K with Z = 4. [BeF 2 (NH 3 ) 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.

Beryllium Diammine Difluoride [BeF 2 (NH 3 ) 2 ]