Acta Cryst. (2003). E59, o1444-o1446  [ doi:10.1107/S1600536803019111 ]

2,6-Diaminopyridinium bromide monohydrate

S. F. Haddad and R. H. Al-Far

Abstract: 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 - interactions. The bromide ion is hydrogen bonded, as acceptor, to two H₂O molecules, with an average BrH-O(H₂O) distance of 3.322  (11)  Å, to the ring N atom BrN-H(NH) 3.353  (3)  Å, and to four amino N atoms, with an average BrH-N(NH₂) 3.63  (14)  Å. The water molecule bonds, as acceptor, to the pyridine N atom OH-N(NH₂) 2.583  (5)  Å. The closest - interaction is between pyridine ring planes, with an interplanar spacing 3.358  Å apart.

Online 5 September 2003

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