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In the non-planar title compound, C16H14N2O2, the dihedral angle between the phenyl rings is 16.67 (8)°. An E conformation is found for each of the imine [1.286 (2) Å] and ethyl­ene [1.335 (2) Å] bonds. The amide O and H atoms are anti, and an intra­molecular hy­droxy O—H...N hydrogen bond is noted. The formation of N—H...O(hy­droxy) hydrogen bonds in the crystal packing leads to helical chains along the b axis. Supra­molecular layers in the ab plane are formed as the chains are linked by C—H...O inter­actions.

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In the title compound, C16H14N2O, the dihedral angle between the phenyl rings is 25.48 (12)°. An E conformation is found for each of the imine [1.269 (3) Å] and ethyl­ene [1.313 (3) Å] bonds. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, leading to zigzag chains along [010]. Supra­molecular layers in the ab plane are formed, whereby the chains are linked by C—H...N and C—H...π inter­actions.
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