Experimental Crystal data

R factor = 0.047; wR factor = 0.129; data-to-parameter ratio = 16.6. The asymmetric unit of the title salt, C8H14N2 2+2NO3, contains two independent dications and four independent nitrate anions. The crystal structure consists of discrete nitrate ions, three of which stack in layers parallel to (001) at z = 0 and 0.5. These layers are connected via m-xylylenediaminium dications. The fourth anion is sandwiched by the two independent organic cations in the asymmetric unit. In the crystal, the ions are connected by a large number of bifurcated and non-bifurcated N—H O(O) hydrogen bonds, forming sheets parallel to (100). These sheets are connected by C— H O hydrogen bonds, forming a three-dimensional network. Related literature For related nitrate salts, see: Gatfaoui et al. (2013, 2014); Marouani et al. (2012); Kefi et al. (2013). For the dichloride salt of the title cation, see: Cheng & Li (2008). For background to hydrogen bonding and aromatic – stacking interactions