3,3'-Diallyl-1,1'-[o-phenyl-enebis(methyl-ene)]diimidazol-3-ium bis-(hexa-fluoro-phosphate)

In the cation of the title mol-ecular salt, C(20)H(24)N(4) (2+)·2PF(6) (-), the central benzene ring makes dihedral angles of 84.19 (7) and 79.10 (7)° with the pendant imidazole rings. In one of the hexa-fluoro-phosphate anions, the six F atoms are disordered over two sets of sites, with an occupancy ratio of 0.842 (3):0.158 (3). In the crystal, the cations and anions are linked by numerous C-H⋯F hydrogen bonds, thereby forming a three-dimensional network.