The title compound, C10H6N2O4, belongs to a series of N-aryl­male­imides. These N-substituted male­imides can be used as photo-initiators for free-radical polymerization. The mol­ecule has crystallographic twofold rotation symmetry. The dihedral angle between the planes of the benzene and imide rings is 42.98 (5)°

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Key indicatorsSingle-crystal X-ray study T = 293 K Mean '(C±C) = 0.002 A Ê R factor = 0.044 wR factor = 0.146 Data-to-parameter ratio = 21.2 For details of how these key indicators were automatically derived from the article, see

The title compound, C10H6N2O4, belongs to a series of N-arylmaleimides, which can be used as photoinitiators for free-radical polymerization. The dihedral angles between the planes of the benzene and imide rings are 56.2 (1) and 52.9 (1)° in the two independent molecules in the asymmetric unit.

The asymmetric unit of the title compound, C3H5N2 +·C6H2N3O7 −·C3H4N2·H2O or H(C3H4N2)2 +·C6H2N3O7 −·H2O, contains a diimidazolium cationic unit, one picrate anion and one mol­ecule of water. In the crystal, the components are connected by N—H⋯O, N—H⋯N and O—H⋯O hydrogen bonds, forming a two-dimensional network parallel to (001). In addition, weak inter­molecular C—H⋯O hydrogen bonds lead to the formation of a three-dimensional network featuring R 5 5(19) rings.