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In the dication of the title salt, C16H21ClN2O2+·2C6H2N3O7 [systematic name: 2-{(4-chloro­phen­yl)[2-(di­methyl­aza­nium­yl)eth­oxy]meth­yl}pyridinium bis­(2,4,6-tri­nitro­phenolate), contains a carbinoxaminium dication and two picrate anions, which are held together through inter­molecular N—H...O hydrogen bonds. In the dication, the two aromatic rings form a dihedral angle of 80.1 (1)°. In the two independent picrate anions, the nitro groups are twisted from the benzene plane, the largest dihedral angle in each ion being 42.8 (1) and 81.1 (5)°. In the crystal, in addition to the classical N—H...O hydrogen bonds, weak C—H...O hydrogen bonds and π–π inter­actions between the aromatic rings of the anions [centroid–centroid distances of 3.5768 (15) and 3.7436 (15) Å] help to establish the packing.

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The title compound, C15H13N3O3, exists in the E conformation with respect to the azo­methane C=N double bond. The pyridyl and phenyl rings form dihedral angles of 35.67 (8) and 36.65 (7)°, respectively with the central C(=O)N2C unit. In the crystal, N—H...O and C—H...O hydrogen bonds connect the mol­ecules into chains along the b axis. Another C—H...O inter­action connects mol­ecules along the c-axis direction, forming layers.
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