title: Crystal structure of 4,4',4''-(1,3,5-triazine-2,4,6-tri-yl)tripyridinium trichloride 2.5-hydrate.
abstract: The asymmetric unit of the title compound, C18H15N6 (3+)·3Cl(-)·2.5H2O, contains two independent (1,3,5-triazine-2,4,6-tri-yl)tripyridinium cations. Both cations are approximately planar, the r.m.s. deviations of fitted non-H atoms being 0.045 and 0.051 Å. In the crystal, extensive O-H⋯Cl, O-H⋯O, N-H⋯Cl and N-H⋯O hydrogen bonds and weak C-H⋯Cl and C-H⋯O inter-actions link the organic cations, Cl(-) anions and water mol-ecules into a three-dimensional supra-molecular architecture. π-π stacking between the pyridine rings of adjacent cations is also observed, the centroid-to-centroid distance being 3.7578 (8) Å.
authors.affiliation: School of Marine Science, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
authors.forename: Bo-Kai
authors.initials: BK
authors.lastname: Ling
authors.affiliation: Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
authors.forename: Xiao-Long
authors.initials: XL
authors.lastname: Feng
authors.affiliation: Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Marine Science, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
authors.forename: Tian-Gang
authors.initials: TG
authors.lastname: Luan
keywords: 1,3,5-triazine; crystal structure; hydrogen bonding; trichloride; π–π inter­actions