title: 2-{(E)-[(4-Methyl-phen-yl)imino]-meth-yl}-4-nitro-phenol-2-{(E)-[(4-methyl-phen-yl)iminio]meth-yl}-4-nitro-phenolate (0.60/0.40).
abstract: The crystal of the title compound, 0.6C(14)H(12)N(2)O(3)·0.4C(14)H(12)N(2)O(3), contains a mixture of its neutral (OH containing) and zwitterionic (NH containing) forms, in a 0.60 (4):0.40 (4) ratio. The former generates an S(6) loop via an intra-molecular O-H⋯N hydrogen bond and the latter generates an S(6) loop via an N-H⋯O hydro-gren bond. The aromatic rings are oriented at a dihedral angle of 42.52 (10)°. In the crystal, C-H⋯π inter-actions occur and aromatic π-π stacking inter-actions [centroid-centroid separations = 3.7106 (12) and 3.9177 (13) Å] consolidate the packing.
authors: M Nawaz
authors: MN
authors: Tahir
authors: Hazoor Ahmad
authors: HA
authors: Shad
authors: Riaz H
authors: RH
authors: Tariq