5-(Prop-2-yn-1-yl)-5H-dibenzo[b,f]azepine: ortho­rhom­bic polymorph

In the title ortho­rhom­bic polymorph (space group Iba2), C₁₇H₁₃N, the dihedral angle between the benzene rings is 55.99 (10)° and the azepine ring adopts a boat conformation. In the crystal, mol­ecules are linked by C—H...π contacts. The previously-reported polymorph [Yousuf et al. (2012). Acta Cryst. E68, o1101] crystallizes in the monoclinic system (space group P2₁/c) with two mol­ecules in the asymmetric unit.

4-[5-(4-Benzoyl­oxyphen­yl)-1,2,4-oxa­diazol-3-yl]phenyl benzoate

In the title compound, C₂₈H₁₈N₂O₅, the dihedral angle between the terminal benzoate rings is 20.67 (12)°. The central oxadiazole ring is almost coplanar with its two benzene ring substituents, making dihedral angles of 4.80 (16) and 5.82 (16)°. In the crystal, pairs of C—H...O hydrogen bonds form inversion dimers with R₂²(40) ring motifs. The structure also features C—H...O, C—H...π and π–π inter­actions [centroid–centroid separation = 3.695 (4) Å].

5-[(4-Benzyl-1H-1,2,3-triazol-1-yl)meth­yl]-5H-dibenzo[b,f]azepine

In the title compound, C₂₄H₂₀N₄, the azepine ring adopts a boat conformation and the dihedral angle between the benzene rings fused to it is 57.95 (8)°. The bond-angle sum at the azepine N atom is 346.6°, indicating a significant deviation from planarity. The triazole ring subtends a dihedral angle of 71.45 (10)° with the terminal phenyl group. A weak intra­molecular C—H...N_a (a = azepine) inter­action occurs, which closes an S(6) ring.