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In the title mol­ecule, C19H14N2O, the benzimidazole unit is close to being planar [maximum deviation = 0.0253 (11) Å] and forms dihedral angles of 68.98 (6) and 20.38 (7)° with the adjacent phenyl and benzene rings; the dihedral angle between the latter two planes is 64.30 (7)°. An intra­molecular O—H...N hydrogen bond generates an S(6) ring motif. In the crystal, mol­ecules are linked by C—H...N and C—H...O hydrogen bonds, and consolidated into a three-dimensional architecture by π–π stacking inter­actions, with a centroid–centroid distance of 3.8428 (12) Å.

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In the title mol­ecule, C18H15NO2, the atoms in the carbazole unit deviate from planarity [maximum deviation from mean plane = 0.1317 (12) Å]. The pyrrole ring makes dihedral angles of 1.01 (8) and 18.56 (10)° with the benzene and furan rings, respectively. The cyclo­hexene ring adopts a half-chair conformation. In the crystal, pairs of N—H...O hydrogen bonds form an R22(10) ring. Mol­ecules are further linked by C—H...O and C—H...π inter­actions, forming a three-dimensional network.

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In the title mol­ecule, C20H15N3, the atoms in the carbazole unit deviate from planarity [maximum deviation from mean plane = 0.1082 (15) Å]. The pyrrole ring makes dihedral angles of 3.17 (8)/4.10 (9), 7.20 (9) and 44.62 (9)° with the fused benzene, pyrazole and phenyl rings, respectively. In the crystal, mol­ecules are linked via N—H...N hydrogen bonds, forming an infinite chain along [010]. Mol­ecules are further linked by nine π–π [centroid–centroid distances vary from 3.6864 (11) to 3.9802 (11) Å] and one C—H...π inter­action, forming a three-dimensional network.

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In the title mol­ecule, C23H14N2O2, the atoms in the carbazole unit deviate from planarity [maximum deviation from mean plane = 0.1018 (8) Å]. The pyrrole ring makes dihedral angles of 4.44 (5), 3.84 (5), 2.18 (5) and 56.44 (5)° with the pyran, fused benzene rings and phenyl ring, respectively. In the crystal, pairs of N—H...O hydrogen bonds generate R22(14) loops and a C—H...N inter­action is also found. Mol­ecules are further linked by a number of π–π interactions [centroid–centroid distances vary from 3.5702 (5) to 3.7068 (6) Å], forming a three-dimensional network.

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In the title mol­ecule, C24H20Cl2O2, the central methyl­benzene ring forms dihedral angles of 42.47 (10) and 34.34 (10)° with the terminal 4-chloro­phenyl fragments. The dihedral angle between the chloro­benzene rings is 34.45 (11)°. A weak intra­molecular C—H...O inter­action generates an S(6) ring motif. The crystal packing exhibits weak C—H...O hydrogen bonds and C—H...π inter­actions.
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