4-(pyrimidin-2-yl)piperazin-1-ium (E)-3-carboxyprop-2-enoate

In the cation of the title salt, C8H13N 4+·C4H3O4 -, the piperazinium ring adopts a slightly distorteded chair conformation. In the crystal, a single strong O-H�O intermolecular hydrogen bond links the anions, forming chains along the c-axis direction. The chains of anions are linked by the cations, via N-H�O hydrogen bonds, forming sheets parallel to (100). These layers are linked by weak C-H�O hydrogen bonds, forming a three-dimensional structure. In addition, there are weak �-� interactions centroid-centroid distance = 3.820 (9) à present involving inversion-related pyrimidine rings