1,1′-[(1,3-Dihydroxypropane-2,2-diyl)dimethylene] dipyridinium bis(hexafluorophosphate)

The title compound, C₁₅H₂₀N₂O ₂²⁺·2PF₆^-, was prepared by anion exchange of two bromide ions in the ionic liquid 2,2′-bis- (pyridinium-1-ylmethyl)-propane-1,3-diol dibromide with potassium hexafluorophosphate. The two pyridine rings are planar (r.m.s. deviations = 0.008 and 0.00440 Å ) and make a dihedral angle of 44.0 (2)°. Intermolecular O-H⋯F and C-H⋯F interactions occur. The four F atoms in each anion were refined as disordered over two sets of sites with an occupancy ration of 0.700 (19):0.300 (19).