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The title compound, C7H4Br2O, has mirror symmetry perpendicular to the tropone ring, and forms a head-to-head association of two nearly parallel mol­ecules. Intermolecular π–π, halogen–halogen and C—H...O interactions are observed in the crystal structure.

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The title compound, also known as 2-amino-5-[4-(octylamino)phen­yl]tropone, C21H28N2O, contains two crystallographically independent mol­ecules in the asymmetric unit. The NH2 group of the 2-amino­tropone unit and the NH group of the amino­benzene unit participate in inter­molecular hydrogen bonding with the O atoms of neighbouring mol­ecules. An inter­molecular π–π inter­action is observed in the crystal structure.

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In the title compound, C15H20N2O2, the N atom of the diethyl­amine group has a planar environment, whereas the N atom of the dimethyl­amine group is pyramidal. Inter­molecular C—H...π and C—H...O inter­actions are observed in the crystal structure.

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The title compound, C36H58N2O3, also known as a liquid crystalline material, has a phase sequence of crystal–smectic C–isotropic liquid. The two benzene rings are nearly coplanar with the central NNO group, and each paraffin chain has an all-trans conformation. The mol­ecules form a tilted layer structure via inter­molecular π–π, C—H...O and C—H...π inter­actions.
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