p-Nitroaniline–3,5-Dinitromethyl Salicylate (1:1) Co-Crystal

The title compound, C₆H₆N₂O₂.C₈H₆N₂O₇, is composed of one molecule of p-nitroaniline and one molecule of 3,5-dinitromethyl salicylate. In this co-crystal, both the p-nitroaniline and 3,5-dinitromethyl salicylate molecules are nearly planar. These two molecules are almost coplanar with respect to each other, with a dihedral angle of 3.2 (2)° between the two aromatic ring least-squares planes. The hydroxyl group of the 3,5-dinitromethyl salicylate molecule forms an intramolecular six-membered ring hydrogen bond to the ester carbonyl O atom [H8...O1 = 1.74 (4), O8...O1 = 2.547 (4) Å, O8—H8...O1 = 144 (3)°]. The p-nitroaniline molecules are aggregated into infinite chains by intermolecular N-H...O hydrogen bonds between one of the amino protons, H1A, and one of the nitro-O atoms, O4B, of the nitroaniline molecules [H1A...O4Bⁱ = 2.22 (3), N1...O4Bⁱ = 2.984 (4) Å, N1—H1A...O4Bⁱ = 152 (3)°; symmetry code: (i) x + , − − y, − + z]. The 3,5-dinitromethyl salicylate molecules are linked to the nitroaniline chains by multiple intermolecular hydrogen bonds [O8...O4B = 2.968 (3) Å, N1...O8ⁱ = 3.147 (3) Å and N1...O9Aⁱ = 3.008 (4) Å].

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