Crystal structure of bis­(propane-1,3-diaminium) hexa­fluorido­aluminate di­aqua­tetra­fluorido­aluminate tetra­hydrate

The title compound, (C(3)H(12)N(2))(2)[AlF(6)][AlF(4)(H(2)O)(2)]·4H(2)O, was obtained by a solvothermal method in ethanol as solvent and with aluminium hydroxide, HF and 1,3-di­amino­propane as educts. The asymmetric unit contains a quarter each of two crystallographically independent propane-1,3-di­ammonium dicat­ions, [AlF(6)](3−) and [AlF(4)(H(2)O)(2)](−) anions and four water mol­ecules. The cations, anions and three of the independent water mol­ecules are situated on special positions mm, while the fourth water mol­ecule is disordered about a mirror plane. In the crystal, inter­molecular N—H⋯F and O—H⋯F hydrogen bonds link the cations and anions into a three-dimensional framework with the voids filled by water mol­ecules, which generate O—H⋯O hydrogen bonds and further consolidate the packing.