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The complete mol­ecule of the title compound, C32H28N2, is generated by crystallographic inversion symmetry. The dihedral angles between the central aromatic ring and the pendant adjacent rings are 61.37 (16) and 74.20 (14)°. The N—H group does not participate in hydrogen bonds and there are no aromatic π–π stacking inter­actions in the crystal.

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The title compound, C14H10Cl2N2O·H2O, has a nearly planar extended conformation [C—N—N—C = −173.66 (15)°]. The dihedral angle between the aromatic rings is 4.6 (2)°. The water mol­ecules alternate with benzohydrazide mol­ecules in chains formed by O—H...O hydrogen bonds which run parallel to the a axis. These chains are linked to neighboring chains through N—H...O and C—H...O inter­actions, forming a layer parallel to (001).

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In the title compound, C21H19ClN2O2, the benzene ring and the naphthalene ring system are oriented at a dihedral angle of 65.24 (10)°. In the crystal, N—H...O, C—H...N and C—H...O hydrogen bonds link the mol­ecules, forming chains along the b-axis direction. Further C—H...O hydrogen bonds link the chains, forming corrugated sheets lying parallel to (10-1).

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The title compound, C21H17N3O3, is a new polymorph of an already published structure [Shashidhar et al. (2006). Acta Cryst. E62, o4473–o4475]. The previously reported structure crystallizes in the monoclinic space group C2/c, whereas the structure reported here is in the tetra­gonal space group I41/a. The bond lengths and angles are similar in both structures. The mol­ecule adopts an extended conformation via intra­molecular N—H...O and O—H...N hydrogen bonds; the terminal phenyl ring and the hy­droxy­lphenyl ring are twisted with respect to the central benzene ring by 44.43 (7) and 21.99 (8)°, respectively. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, weak C—H...O hydrogen bonds and weak C—H...π inter­actions into a three-dimensional supra­molecular network.
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