Abstract

In the title salt, C24H22N4O4 2+·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.

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