Research Information System
ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS, vol.62, 2006 (SCI-Expanded)
In the title compound, 2C(4)H(5)N(3)(+)center dot C4O4 (2-)center dot 1.394H(2)O, both the squarate and the aminopyrimidinium molecules lie on a crystallographic mirror plane and the water molecules are located between the mirror planes. The inversion- related aminopyrimidine molecules are linked through N-H . . .N hydrogen bonds [N . . .N = 2.975 (3) angstrom] to form dimers. The dimers and the squarate dianions are alternately arranged and linked via N-H . . .O hydrogen bonds [N . . .O = 2.621 (2) and 2.811 (2) angstrom] to form a chain along the c axis. Chains lying on the adjacent planes are linked via O-H . . .O hydrogen bonds [O. . .O = 2.713 (2) angstrom] involving the water molecules to form a three-dimensional network.