3,6-Dibromo-9-eth­yl-9H-carbazole

The title compound, C₁₄H₁₁Br₂N, was synthesized by N-alkyl­ation of bromo­ethane with 3,6-dibromo-9H-carbazole. The carbazole ring system is essentially planar and makes a dihedral angle of 94.7 (3)° with the plane formed by the eth­yl C and carbazole N atoms.

N,N′-Dibenzoyl­piperazine

In the title structure, C₁₈H₁₈N₂O₂, the piperazine ring adopts a chair conformation and the two phen­yl rings are parallel. The mol­ecule possesses a crystallographically imposed inversion centre. In the crystal structure, weak inter­molecular C—H...O hydrogen bonds link the mol­ecules into ribbons along the b axis.

Bis[2-(1-phen­yl-1H-tetra­zol-5-ylsulfan­yl)eth­oxy] ether

The title compound, C₂₀H₂₂N₈O₂S₂, contains a center of inversion at the mid-point of the central C-C bond. The mean planes of the phen­yl and the 1H-tetra­zol-5-ylsulfan­yl rings make a dihedral angle of 53.95 (16)°.