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In the title salt, C18H19N4O+·PF6−, the dihedral angle between the benzimidazolium and benzimidazole ring systems is 16.24 (2)°. In the cation, a π–π interaction is observed between the imidazolium ring and the benzene ring of the benzimidazole ring system [centroid–centroid distance = 3.5713 (11) Å]. The PF6− ion is disordered over two sites, with occupancies of 0.895 (2) and 0.105 (2). In the crystal structure, pairs of N—H...N hydrogen bonds link the cations, forming centrosymmetric dimers. The dimers are linked via π–π interactions [centroid–centroid distance = 3.5606 (11) Å]. In addition, C—H...F hydrogen bonds are observed.