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In the title compound, C22H18N4O2, the mol­ecules lie across an inversion centre. The dihedral angle between the mean planes of the central and terminal benzene rings is 66.03 (2)°. The mol­ecule displays trans and anti conformations about the C=N and N—N bonds, respectively. In the crystal, N—H...O hydrogen bonds, with the O atoms of C=O groups acting as acceptors, link the mol­ecules into a chain along [101].

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In the title compound, C11H10Br2O2, the cyclo­pentene ring fused to the benzene ring adopts an envelope conformation, with the C atom attached to the Br atom as the flap. The crystal structure does not exhibit any classical hydrogen bonds. The mol­ecular packing is stabilized by van der Waals forces and π–π stacking inter­actions with a centroid–centroid distance of 3.811 (4) Å.

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The title Schiff base, C17H19IN2O, is not planar, displaying a dihedral angle of 34.9 (2)° between the two aromatic rings. The mol­ecular conformation allows the formation of a strong intra­molecular O—H...N hydrogen bond with graph-set motif S(6) between the hy­droxy group and the imine N atom.

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In the title compound, C15H10FNO3, the dihedral angle between the isoindoline-1,3-dione and 3-fluoro-4-methyl­phenol groups is 86.88 (8)°. The isoindoline-1,3-dione fragment is almost planar, with an r.m.s. deviation of 0.0154 Å within the group. Inter­molecular C—H...O hydrogen bonds generate C(6) chains running parallel to the [010] direction.

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In the title compound, C19H16ClNO, the dihedral angle between the naphthalene ring system and the chloro­benzene ring is 61.90 (10)° and the C—N—C—C torsion angle is 174.6 (2)°. The mol­ecular structure is stabilized by an intra­molecular C—H...N hydrogen bond. The crystal structure features π–π stacking inter­actions [centroid–centroid distances = 3.7325 (17) and 3.8150 (17) Å].

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In the title compound, C14H11IN2O3·CH4O, the dihedral angle between the benzene rings is 33.2 (3)°. The mol­ecule displays trans and anti conformations about the C=N and N—N bonds, respectively. There is an intra­molecular O—H...N(azomethine) hydrogen bond. Inter­molecular N—H...O and O—H...O hydrogen bonds consolidate mol­ecules into a three-dimensional architecture.

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In the title compound, C21H21NO, the dihedral angle between the naphthalene ring system and the benzene ring is 64.61 (6)°. The mol­ecular structure is stabilized by an intra­molecular C—H...N hydrogen bond.
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