9-(4-Bromo­but­yl)-9H-carbazole

In the title compound, C₁₆H₁₆BrN, the tricyclic carbazole system is essentially planar (r.m.s. deviation of all non-H atoms = 0.010 Å). The dihedral angle between the two outer carbazole rings is 1.1 (3)°. There are no directional inter­molecular contacts in the crystal packing.

6-Bromo­pyridine-2-carbaldehyde phenyl­hydrazone

The title compound, C₁₂H₁₀BrN₃, is essentially planar (r.m.s. deviation of all non-H atoms = 0.0174 Å), with a dihedral angle of 0.5 (2)° between the two aromatic rings. In the crystal, mol­ecules are linked by weak N—H...N inter­actions, forming a zigzag chain running parallel to [001].

2,4,6-Trinitro­phenyl 3-methyl­benzoate

In the title benzoate derivative, C₁₄H₉N₃O₈, the benzene rings form a dihedral angle of 87.48 (5)°. The central ester unit forms an angle of 19.42 (7)° with the methyl­benzene ring, indicating a significant twist. In the crystal, the mol­ecules are linked by weak C—H...O inter­actions forming a helical chain along [010].

2,4,6-Trinitro­phenyl 4-methyl­benzoate

In the title compound, C₁₄H₉N₃O₈, the benzene rings form a dihedral angle of 69.02 (5)°. The central ester group is rotated by 25.86 (9)° relative to the p-tolyl group. In the crystal, the mol­ecules are linked by C—H...O inter­actions into helical chains along [010].

3,5-Bis(benz­yloxy)benzoic acid

In the title compound, C₂₁H₁₈O₄, the outer benzyl rings are disordered over two resolved positions in a 0.50 ratio. The O—CH₂ groups form dihedral angles of 4.1 (2) and 10.9 (4)° with the central benzene ring, adopting a syn–anti conformation with respect to this ring. In the crystal, the mol­ecules are linked by O—H...O hydrogen bonds and weak C—H...O inter­actions, forming chains along [010].