Acta Cryst. (2004). E60, o747-o749  [ doi:10.1107/S1600536804007597 ]

Co-existence of water-mediated and normal base pairs in a supramolecular ribbon in 2-amino-4,6-dimethylpyrimidinium bromide 2-amino-4,6-dimethylpyrimidine monohydrate

P. Panneerselvam, P. T. Muthiah and S. Francis

Abstract: In the crystal structure of the title compound, C₆H₁₀N₃⁺·Br^-·C₆H₉N₃·H₂O, the asymmetric unit contains a 2-amino-4,6-dimethylpyrimidinium cation, a Br^- anion, a neutral 2-amino-4,6-dimethylpyrimidine molecule and a water molecule. Each neutral base molecule is paired with another inversion-related molecule through N-HN hydrogen bonds to form dimers, and these are linked to one another through water-mediated hydrogen bonds, generating a supramolecular ribbon. The cations also pair with one another through N-HN hydrogen bonds. The cation pairs are stacked on top of the neutral pairs. The Br^- anion also takes part in hydrogen bonding (N/O-HBr).

Online 9 April 2004

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