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Key indicators: single-crystal X-ray study; T = 173 K; mean (C-C) = 0.005 Å; R factor = 0.042; wR factor = 0.103; data-to-parameter ratio = 13.2.The geometric parameters of the title molecule, C 15 H 12 BrN 3 O 4 , are in the usual ranges. The dihedral angle between the two benzene rings is 49.69 (10) . In the crystal structure, molecules are connected by intermolecular N-HÁ Á ÁO hydrogen bonds to form a one-dimensional chain in the c-axis direction. ExperimentalCrystal data C 15 H 12 BrN 3 O 4 M r = 378.19 Monoclinic, P2 1 =c a = 7.2604 (8) Å b = 21.8931 (19) Å c = 9.5795 (12) Å = 97.882 (9) V = 1508.3 (3) Å 3 Z = 4 Mo K radiation = 2.75 mm À1 T = 173 (2) K 0.33 Â 0.32 Â 0.30 mm Data collection Stoe IPDS II two-circle diffractometer Absorption correction: multi-scan (MULABS; Spek, 2003; Blessing, 1995) T min = 0.414, T max = 0.436 9259 measured reflections 2818 independent reflections 2368 reflections with I > 2(I) R int = 0.060

In the tripodinium cation of the title compound {systematic name: 2-[(E)-1-(4-methyl­phen­yl)-3-(pyrrolidin-1-ium-1-yl)prop-1-en­yl]pyridinium bis­(2,4,6-trinitro­phenolate)}, C19H24N2 +·2C6H2N3O7 −, the N atoms on both the pyrrolidine and pyridinium groups are protonated. The pyrrolidine group adopts a slightly distorted envelope configuration. Strong N—H⋯O cation–anion hydrogen bonds and weak inter­molecular N—H⋯O inter­actions link the dication and two anions. In both picrate anions, the nitro groups display rotational disorder over two orientations in a 0.605 (6):0.395 (6) ratio. The crystal packing also features weak inter­molecular π–π [centroid–centroid distance = 3.8036 (14) Å] and C—H⋯O inter­actions.

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