title: 1,1'-Dimethyl-4,4'-(2,4-di-1-naphthyl-cyclo-butane-1,3-di-yl)dipyridinium-(E)-1-methyl-4-[2-(1-naphth-yl)vin-yl]pyridinium-4-amino-benzene-sulfonate-water (0.25/1.50/2/2).
abstract: In the title compound, 1.5C(18)H(16)N(+)·0.25C(36)H(32)N(2) (2+)·2C(6)H(6)NO(3)S(-)·2H(2)O, the monocation exists in the E configuration with respect to the ethenyl C=C double bond and is almost planar, the dihedral angles between the pyridinium and the fused six-membered rings being 3.1 (7) and 3.8 (8)°. The dication lies about an inversion centre. In the crystal, the dication occupies almost the same site occupied by monocations at (x, y, z) and (-x, 1 - y, 1 - z). The anions and water mol-ecules are linked into a chain along the a axis by O-H⋯O and N-H⋯O hydrogen bonds. The structure is further stabilized by C-H⋯O hydrogen bonds and π-π inter-actions between pyridinium and benzene rings, with centroid-centroid distances in the range 3.516 (9)-3.553 (8) Å. The crystal is a twin with twin law, TWIN 0 0 0 0 1 0 1. The monocation and dication are disordered with fractional site occupancy ratio of 0.75:0.25.
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Kullapa
authors.initials: K
authors.lastname: Chanawanno
authors.forename: Suchada
authors.initials: S
authors.lastname: Chantrapromma