Dabconium ortho­fluoro­beryl­late hemihydrate

Alternating C₆H₁₄N₂²⁺ and BeF₄]^2? units within the ac plane of 1,4‐diazo­niabi­cyclo­2.2.2]­octane tetra­fluoro­beryl­lium hemihydrate, (C₆H₁₄N₂)BeF₄]·0.5H₂O, combine to form double chains via hydrogen bonding. These double chains connect through bifurcated hydrogen bonds to water mol­ecules, which lie on twofold axes, producing a two‐dimensional sheet. Very weak hydrogen‐bond interactions, along the b axis, join the sheets to produce a three‐dimensional network.