2,6-Diaminopyridinium bromide monohydrate

In the title compound, [C5H6N3]Br·H2O, the 2,6-di­amino­pyridine is protonated on the ring N atom. The cation is planar. The moieties are held together by extensive hydrogen bonding and by π–π interactions. The bromide ion is hydrogen bonded, as acceptor, to two H2O mol­ecules, with an average Br⋯H—O(H2O) distance of 3.322 (11) A, to the ring N atom Br⋯N—H(NH) 3.353 (3) A, and to four amino N atoms, with an average Br⋯H—N(NH2) 3.63 (14) A. The water mol­ecule bonds, as acceptor, to the pyridine N atom O⋯H—N(NH2) 2.583 (5) A. The closest π–π interaction is between pyridine ring planes, with an interplanar spacing 3.358 A apart.