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

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—H⋯N 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—H⋯N hydrogen bonds. The cation pairs are stacked on top of the neutral pairs. The Br⁻ anion also takes part in hydrogen bonding (N/O—H⋯Br).