title: Melaminium 2,4,6-trihydroxy-benzoate dihydrate.
abstract: In the title compound, C(3)H(7)N(6) (+)·C(7)H(5)O(5) (-)·2H(2)O, the melaminium and benzoate ions are approximately planar (r.m.s. deviation of the non-hydrogen atoms is 0.093 Å) and there is a strong C(2) (2)(8) hydrogen-bonding embrace between them. The centre of symmetry generates a second acid-base pair which is bound to the first by a C(2) (2)(8) (N-H⋯N) embrace common between melamine mol-ecules in similar compounds. Further extensive hydrogen bonding assembles the components into a three-dimensional hydrogen-bonded network.
authors.affiliation: Department of Chemistry, University of Hull, Kingston upon Hull HU6 7RX, England.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Prior
authors.forename: Osman
authors.initials: O
authors.lastname: Goch
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Kift