Crystal structure of 4,4′-[(1,3,5,7-tetra­oxo-1,3,3a,4,4a,5,7,7a,8,8a-deca­hydro-4,8-etheno­pyrrolo­[3,4-f]iso­indole-2,6-di­yl)bis­(methyl­ene)]bis­(pyridin-1-ium) dinitrate

摘要

In the title salt, C24H22N4O42+·2NO3−, the cation is U-shaped with the two iso­indole dione rings inclined to one another by 60.41 (13)°, while the two outer pyridine rings are inclined to one another by 2.77 (12)°. The dihedral angles between the pyridine ring and the adjacent iso­indole dione ring are 71.82 (12) and 86.44 (13)°. In the crystal, each nitrate anion is linked to a protonated pyridine ring by N—H⋯O hydrogen bonds. These units are linked by a series of C—H⋯O hydrogen bonds, forming a three-dimensional structure.