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In the title compound, C 25 H 20 Br 2 N 22+ ·2NO 3− , the cation lies on a twofold rotation axis which imposes disorder of the dibromo­fluorene unit. In addition, the unique nitrate anion is disordered over two general sites of equal occupancy. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds.

2,7-Dibromo-9,9-bis[(pyridin-1-ium-4-yl)methyl]fluorene dinitrate