organic compounds
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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.
organic compounds
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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—HO hydrogen bonds which run parallel to the a axis. These chains are linked to neighboring chains through N—HO and C—HO interactions, forming a layer parallel to (001).
organic compounds
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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—HO, C—HN and C—HO hydrogen bonds link the molecules, forming chains along the b-axis direction. Further C—HO hydrogen bonds link the chains, forming corrugated sheets lying parallel to (10-1).
organic compounds
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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—HO and O—HN 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—HO hydrogen bonds, weak C—HO hydrogen bonds and weak C—Hπ interactions into a three-dimensional supramolecular network.