title: 5-Diethyl-amino-2-{[2-(2,4-dinitro-phen-yl)hydrazin-1-yl-idene]meth-yl}phenol.
abstract: In the title compound, C(17)H(19)N(5)O(5), obtained from the condensation reaction of 4-diethyl-amino-2-hy-droxy-benzalde-hyde and 2,4-dinitro-phenyl-hydrazine, the two benzene rings are twisted by a dihedral angle of 1.75 (12)°. The nitro groups are slightly twisted with the respect to the benzene ring to which they are attached, making dihedral angles of 8.20 (15) and 5.78 (15)°. An intra-molecular O-H⋯N hydrogen bond occurs. In the crystal, mol-ecules are linked by pairs of inter-molecular N-H⋯O hydrogen bonds, forming dimers through R(2) (2)(12) rings. These dimers are further linked by C-H⋯O and C-H⋯π and weak slipped π-π inter-actions [centroid-centroid distance = 3.743 (2)Å]. One of the ethyl groups is disordered over two positions, with occupancy factors in the ratio 0.72:0.28.
authors: Lin-Xiu
authors: LX
authors: Zhao
authors: Gang-Shen
authors: GS
authors: Li
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