1-Benzyl­imidazolium hexa­fluoro­phosphate–1-benzyl­imidazole (1/1)

In the title compound, C(10)H(11)N(2) (+)·PF(6) (−)·C(10)H(10)N(2), the H atom involved in protonation is disordered equally between the cation and the neutral mol­ecule. The dihedral angle between the phenyl and imidazole rings is 82.6 (2)°. In the crystal structure, there are head-to-tail π–π stacking inter­actions between imidazole rings; the inter­planar separation is 3.295 (1) Å and the centroid–centroid separation is 3.448 (3) Å. In the centrosymmetric anion, two F atoms are disordered over two positions; the refined site-occupancy factors are 0.855 (11) and 0.145 (11).