title: 1,1'-Methyl-enedipyridinium dichloride monohydrate.
abstract: In the crystal structure of the title salt, C(11)H(12)N(2) (2+)·2Cl(-)·H(2)O, the dication adopts a butterfly shape [dihedral angle between rings = 69.0 (1)°] with the water mol-ecule lying in the V-shaped cavity. Each O-H bond of the water molecule lies parallel to an aromatic ring and forms an O-H⋯Cl inter-action to a chloride anion. The methyl-ene C atom in the dication and the water O atoms lie on special positions of twofold site symmetry.
authors.forename: Wen-Zhen
authors.initials: WZ
authors.lastname: Fu
authors.forename: Wei-Juan
authors.initials: WJ
authors.lastname: Wang
authors.forename: Yun-Yin
authors.initials: YY
authors.lastname: Niu
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng