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 supra-molecular 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).