title: 2-[(E)-2-(4-Chloro-phen-yl)ethen-yl]-1-methyl-pyridinium 4-chloro-benzene-sulfonate.
abstract: In the title salt, C(14)H(13)ClN(+)·C(6)H(4)ClO(3)S(-), the cation exists in an E configuration with respect to the ethynyl bond and is approximately planar, with a dihedral angle of 3.4 (2)° between the pyridinium and benzene rings. The anion is approximately perpendicular to the cation plane, the benzene ring of the anion making dihedral angles of 89.4 (2) and 89.9 (2)°, respectively, with the pyridinium and benzene rings of the cation. In the crystal structure, the cations are linked into a chain along the c axis by C-H⋯Cl inter-actions. The anions are linked to the adjacent cation chains by C-H⋯O and C-H⋯Cl inter-actions, forming a two-dimensional network parallel to the bc plane. The crystal structure is further stabilized by C-H⋯π inter-actions. A π-π inter-action is also observed between the pyridinium ring and the benzene ring of the cation with a centroid-centroid distance of 3.668 (3) Å.
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