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In the title compound, 2C14H8N4O6·CH2Cl2, the di­chloro­methane solvent mol­ecule resides on a crystallographic twofold axis. The mean plane of the phthaliso­imide ring is oriented at a dihedral angle of 32.93 (12)° with respect to the nitro-substituted benzene ring. An intra­molecular N—H...O hydrogen bond occurs. The crystal packing features a short Cl...O halogen-bond inter­action [3.093 (3) Å].

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The title compound, C16H8Cl4O2, crystallizes with two independent mol­ecules in the asymmetric unit. Both mol­ecules have a Z conformation around the central double bond and they show significantly different C—C—C—O torsion angles between the aromatic ring and the carbonyl group [30.1 (7) and 3.9 (7)° in one molecule and 23.5 (7) and 9.3 (8)° in the other]. The crystal packing shows short halogen Cl...O [3.003 (5) and 3.246 (4) Å] and Cl...Cl [3.452 (2) Å] contacts and aromatic C—H...Cl and C—H...O inter­actions link the molecules, resulting in chains propogating along [100]. The crystal structure also features π–π stacking inter­actions between aromatic units of the two independent mol­ecules, with a centroid–centroid distance of 3.9264 (6) Å.

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The title compound, C18H14Cl2O4, adopts a Z conformation around the cental C=C bond. The two aromatic rings of the mol­ecule are nearly perpendicular to each other, with a dihedral angle between of 86.22 (14)°. The meth­oxy substituents lie close to the plane of the attached benzene rings. The C(ar)—C(ar)—O—C(Me) torsion angles are −2.4 (7) and 7.5 (6)°. Weak C—H...O inter­actions link the mol­ecules forming a three-dimensional network. The crystal packing also displays short [3.160 (3) Å] Cl...O halogen-bonding contacts between mol­ecules related by the screw axis. The structure exhibits disorder of one carbonyl O atom with a refined occupancy ratio of 0.21 (6):0.79 (6).

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In the title compound, C17H14ClNOS, the aromatic rings are inclined to one another by 64.22 (9)°. The acrylo­nitrile group (C=C—C[triple bond]N) is planar to within 0.003 (2) Å, with the S atom and the methyl C atom displaced from this plane by 0.2317 (6) and −0.637 (2) Å, respectively. In the crystal, mol­ecules are linked via pairs of C—H...π inter­actions, forming inversion dimers. There are no other significant inter­molecular inter­actions present.
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