title: 2-Amino-3-methyl-pyridinium 2-amino-5-methyl-pyridinium sulfate monohydrate.
abstract: The asymmetric unit of the title compound, 2C(6)H(9)N(2) (+)·SO(4) (2-)·H(2)O, contains two isomeric protonated amino-methyl-pyridine cations, a sulfate anion and a solvent water mol-ecule. The cations are in the iminium tautomeric form. In the crystal structure, inter-molecular O-H⋯O, N-H⋯O and weak C-H⋯O hydrogen bonds link the components into a three-dimensional network. Additional stabilization is provided by weak π-π stacking inter-actions, with centroid-centroid distances of 3.758 (2) and 3.774 (1) Å.
authors.forename: Jiang
authors.initials: J
authors.lastname: Gong
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Shi-Feng
authors.initials: SF
authors.lastname: Ni
authors.forename: Yong-Yao
authors.initials: YY
authors.lastname: Zhang
authors.forename: Hai-Bin
authors.initials: HB
authors.lastname: Wang