title: 3,3'-Dibenzyl-1,1'-[naphthalene-1,4-diylbis(methyl-ene)]di(1H-imidazol-3-ium) bis-(hexa-fluoro-phosphate).
abstract: In the title N-heterocyclic carbene compound, C(32)H(30)N(4) (2+)·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 intra-molecular C-H⋯N hydrogen bond occurs. The crystal structure is stabilized by C-H⋯F inter-actions. In addition, π-π inter-actions [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.
authors: Department of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou 635000,  People's Republic of China.
authors: Chang-Lu
authors: CL
authors: Liu
authors: Kun
authors: K
authors: Huang