Acta Cryst. (2012). E68, o3321-o3322 [ doi:10.1107/S1600536812045308 ]
Abstract: In the title salt, 2C4H6ClN4+·C4H2O42-, the complete fumarate dianion is generated by crystallographic inversion symmetry. The cation is essentially planar, with a maximum deviation of 0.018 (1) Å. In the anion, the carboxylate group is twisted slightly away from the attached plane, the dihedral angle between the carboxylate and (E)-but-2-ene planes being 12.78 (13)°. In the crystal, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms of the anion via a pair of N-HO hydrogen bonds, forming an R22(8) ring motif. In addition, another type of R22(8) motif is formed by centrosymmetrically related pyrimidinium cations via N-HN hydrogen bonds. These two combined motifs form a heterotetramer. The crystal structure is further stabilized by stong N-HO, N-HCl and weak C-HO hydrogen bonds, resulting a three-dimensional network.
Hyper-Text Markup Language (HTML) file
Chemical Markup Language (CML) file (6.5 kbytes)
To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.
The download button will force most browsers to prompt for a file name to store the data on your hard disk.
Where possible, images are represented by thumbnails.
Copyright © International Union of Crystallography