title: 1,1'-[(1,3-Dihydroxypropane-2,2-diyl)dimethylene]dipyridinium bis-(hexa-fluoro-phosphate).
abstract: The title compound, C(15)H(20)N(2)O(2) (2+)·2PF(6) (-), was prepared by anion exchange of two bromide ions in the ionic liquid 2,2'-bis-(pyridinium-1-ylmeth-yl)-propane-1,3-diol dibromide with potassium hexa-fluoro-phosphate. 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).
authors.forename: Ai-Lin
authors.initials: AL
authors.lastname: Yuan
authors.forename: Chun-Ling
authors.initials: CL
authors.lastname: Zheng
authors.forename: Ling-Hua
authors.initials: LH
authors.lastname: Zhuang
authors.forename: Chang-Sheng
authors.initials: CS
authors.lastname: Wang
authors.forename: Guo-Wei
authors.initials: GW
authors.lastname: Wang