Melaminium glutarate monohydrate.

The crystal structure of the title new melaminium salt, 2,4,6-triamino-1,3,5-triazin-1-ium glutarate monohydrate, C(3)H(7)N(6)(+) x C(5)H(7)O(4)(-) x H(2)O, is built up from singly protonated melaminium residues, mono-dissociated glutarate ions and water molecules. The melaminium residues are interconnected by four N[bond]H...N hydrogen bonds to form chains. These chains of melaminium residues form a stacking structure. The glutarate anions form a hydrogen-bonded zigzag polymer of the form [...HOOC(CH(2))(3)COO...HOOC(CH(2))(3)COO...](n). The oppositely charged moieties, i.e. the melaminium and glutarate chains, form two-dimensional polymeric sheets. These sheets are interconnected by O[bond]H...O hydrogen bonds between the COO(-) moieties and the water molecules, and these hydrogen bonds stabilize the stacking structure.