Abstract
The title compound, (C3H10N2)(2)[AlF6]F center dot 3H(2)O, was obtained using the solvothermal method with aluminium hydroxide, HF and propane-1,3-diamine as precursors in ethanol as solvent. The structure consists of isolated [AlF6](3-) octahedra, diprotonated propane-1,3-diamine cations [(H(2)dap)(2+)],free fluoride ions and water molecules of solvation. The Al-F bond lengths in the octahedral [AlF6](3-) anions range from 1.7690 (19) to 1.8130 (19) angstrom, with an average value of 1.794 angstrom. Each [AlF6](3-) anion is surrounded by three water molecules and by six diprotonated amine cations. The 'free' fluoride ion is hydrogen bonded to four H atoms belonging to four dications and has a distorted tetrahedral geometry. The three water molecules are connected by hydrogen bonds, forming trimers that connect the AlF6 octahedra and dications into a three-dimensional framework.