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In the title  N -heterocyclic carbene compound, C 32 H 30 N 42+ ·2PF 6− , the mean plane of the naphthalene ring system makes dihedral angles of 79.15 (15) and 76.85 (16) with the imidazole rings and 56.15 (19) and 80.56 (16)° with the benzene rings. An intra­molecular C—H⋯N hydrogen bond occurs. The crystal structure is stabilized by C—H⋯F inter­actions. In addition, π–π inter­actions [centroid–centroid distances = 3.848 (1) and 3.574 (3) Å] are observed. The nine equatorial F atoms in the two PF 6−  anions were disordered over two positions with occupancy ratios of 0.545 (10):0.455 (10) and 0.793 (11):0.207 (11) in the two anions.

3,3′-Dibenzyl-1,1′-[naphthalene-1,4-diylbis(methylene)]di(1H-imidazol-3-ium) bis(hexafluorophosphate)