(E)-1-[1-(2-Chloro-phen-yl)ethyl-idene]-2-(2,4-dinitro-phen-yl)hydrazine

(E)-1-(2,4-Dinitro-phen-yl)-2-[1-(3-nitro-phen-yl)ethyl-idene]hydrazine

In the asymmetric unit of the title compound, C(14)H(11)N(5)O(6), there are three crystallographically independent mol-ecules with similar conformations but some differences in bond angles. The mol-ecules are slightly twisted with the dihedral angles between the benzene rings being 10.02 (14), 8.41 (15) and 1.40 (14)°. In each mol-ecule, an intra-molecular N-H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, mol-ecules are linked by weak C-H⋯O inter-actions into a three-dimensional network. π-π inter-actions with centroid-centroid distances of 3.5635 (17)-3.8273 (18) Å are observed.

(E)-1-(2,4-Dinitro-phen-yl)-2-[1-(3-fluoro-phen-yl)ethyl-idene]hydrazine

The mol­ecule of the title hydrazone derivative, C₁₄H₁₁FN₄O₄, is nearly planar, with a dihedral angle between the benzene rings of 3.71 (7)°. The central ethyl­idenehydrazine N—N=C—C plane makes dihedral angles of 5.32 (10) and 9.02 (10)° with the 2,4-dinitro- and 3-fluoro-substituted benzene rings, respectively. An intra­molecular N—H⋯O bond generates an S(6) ring motif. In the crystal, mol­ecules are linked by weak C—H⋯O inter­actions into a sheet parallel to (10-1). The mol­ecules are further stacked along the a axis by π–π inter­actions with centroid–centroid distances of 3.6314 (9) and 3.7567 (10) Å. A C⋯F short contact [2.842 (3) Å] is observed. The 3-fluoro­phenyl group is disordered over two orientations with a site-occupancy ratio of 0.636 (3):0.364 (3).

(1Z,2E)-N'-{2-Chloro-1-methyl-2-[2-(4-methyl-phen-yl)hydrazin-1-yl-idene]ethyl-idene}-4-meth-oxy-benzohydrazide

The asymmetric unit of the title compound, C₁₈H₁₉ClN₄O₂, contains two mol­ecules, in which the dihedral angles between the benzene rings are 43.60 (12) and 58.65 (13)°. The hydrazine N atoms are twisted slightly out of the planes of the tolyl and meth­oxy­benzene rings: the C—C—N—N and N—N—C—C torsion angles are 171.1 (2) and −174.4 (2)°, respectively, for one mol­ecule and −177.4 (2) and −170.6 (2)°, respectively, for the other. In the crystal, mol­ecules are linked by N—H⋯O and C—H⋯O hydrogen bonds into chains propagating along the b-axis direction.

(E)-1-[1-(3-Chloro-phen-yl)ethyl-idene]-2-(2,4-dinitro-phen-yl)hydrazine

There are two crystallographically independent mol-ecules in the asymmetric unit of the title compound, C(14)H(11)ClN(4)O(4), with the same E conformation about the C=N double bond. The mol-ecules are approximately planar, with a dihedral angle between the benzene rings of 10.24 (12)° in one mol-ecule and 4.73 (12)° in the other. In both mol-ecules, the ortho-nitro groups of the 2,4-dinitro-phenyl units are coplanar to their bound benzene rings, whereas the para-nitro groups are slightly twisted. In each mol-ecule, intra-molecular N-H⋯O hydrogen bonds generate S(6) ring motifs. In the crystal, mol-ecules are linked by weak C-H⋯O inter-actions into sheets parallel to the (-102) plane. These sheets are stacked by π-π inter-actions, with centroid-centroid distances of 3.7008 (14) and 3.7459 (14) Å. A Cl⋯O short contact [3.111 (2) Å] is observed.

(E)-1-(2,4-Dinitro-phen-yl)-2-[1-(4-fluoro-phen-yl)ethyl-idene]hydrazine

The title compound, C₁₄H₁₁FN₄O₄, crystallizes with two essentially planar mol­ecules in the asymmetric unit; the dihedral angles between the benzene rings are 1.57 (15) and 6.17 (15)°. In each mol­ecule, an intra­molecular N—H⋯O hydrogen bond generates an S(6) ring. In the crystal, mol­ecules are linked by weak C—H⋯O and C—H⋯F inter­actions into sheets lying parallel to (120). O⋯C [2.980 (4) Å] and O⋯N [2.892 (3) Å] short contacts also occur.