In the title compound, C(9)H(7)ClN(2)O(6), the nitro groups and the ester group make dihedral angles of 44.0 (1), 89.6 (1) and 164.1 (1)°, respectively, with the benzene ring. In the crystal, mol-ecules are linked through weak C-H⋯O hydrogen-bonding inter-actions. Mol-ecules are stacked via π-π inter-actions about inversion centers, with a centroid-centroid distance of 3.671 (2) Å.

In the mol-ecule of the title compound, C(8)H(5)ClN(2)O(6), the two nitro groups and the ester group make dihedral angles of 29.6 (1)°, 82.3 (1)° and 13.7 (1)°, respectively, with the benzene ring. In the crystal structure weak C-H⋯O inter-actions are present.

In the title compound, C(15)H(10)Cl(3)NO(2), an intra-molecular N-H⋯O hydrogen bond forms a six-membered ring and enforces an almost coplanar conformation for the acetamido group, the central benzene ring and the bridging carbonyl C-C(=O)-C group: the dihedral angles between the benzene ring and the acetamide and carbonyl C-C(=O)-C planes are 7.06 (11) and 7.17 (12)°, respectively. The dihedral...

The mol-ecule of the title compound, C(14)H(10)Cl(2)N(2)O(2), displays a trans configuration with respect to the C=N double bond and has an intramolecular O-H⋯N hydrogen bond. The dihedral angle between the two benzene rings is 1.4 (2)°. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯O hydrogen bonds, forming chains running along the a direction.