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3,4-Diamino-pyridinium 4-nitro-benzoate-4-nitro-benzoic acid (1/1)



3,4-Diamino-pyridinium 4-nitro-benzoate-4-nitro-benzoic acid (1/1)



Acta Crystallographica. Section E Structure Reports Online 65(Pt 8): O1887-8



In the title compound, C(5)H(8)N(3) (+)·C(7)H(4)NO(4) (-)·C(7)H(5)NO(4), the non-H atoms of the 3,4-diamino-pyridinium cation are coplanar, with a maximum deviation of 0.022 (1) Å. The carboxyl-ate and nitro groups of the 4-nitro-benzoate anion are twisted out of the attached ring planes by dihedral angles of 15.89 (8) and 10.20 (8)°, respectively. In the 4-nitro-benzoic acid mol-ecule, the carboxyl and nitro groups form dihedral angles of 18.25 (8) and 6.55 (8)°, respectively, with the benzene ring. In the crystal, the constituent units form two-dimensional networks parallel to (001) by O-H⋯O, N--H⋯O and C-H⋯O hydrogen bonds. Weak π-π inter-actions involving inversion-related 4-nitro-benzoic acid mol-ecules [centroid-centroid distance = 3.7325 (8) Å] and inversion-related 4-nitro-benzoate mol-ecules [centroid-centroid distance = 3.7124 (8) Å] are also observed.

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Accession: 051039938

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PMID: 21583579

DOI: 10.1107/s1600536809027354


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