Diaminopyrimidinium Squarate 1.394-Hydrate

Abstract

In the title compound, 2C<inf>4</inf>H<inf>5</inf>N<inf>3</inf> +·C<inf>4</inf>O<inf>4</inf>2-·1.394H <inf>2</inf>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) Å] 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) Å] 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) Å] involving the water molecules to form a three-dimensional network. © 2006 International Union of Crystallography All rights reserved.