Melaminium glutarate monohydrate

The crystal structure of the title new melaminium salt, 2,4,6-triamino-1,3,5-triazin-1-ium glutarate monohydrate, C3H7N6+·-C5 H7O4-· H2O, is built up from singly protonated melaminium residues, mono-dissociated glutarate ions and water molecules. The melaminium residues are interconnected by four N-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(CH2)3COO⋯ HOOC(CH2)3COO⋯]n. The oppositely charged moieties, i.e. the melaminium and glutarate chains, form two-dimensional polymeric sheets. These sheets are interconnected by O-H⋯O hydrogen bonds between the COO- moieties and the water molecules, and these hydrogen bonds stabilize the stacking structure.