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In the title compound, C12H11Cl3N2O4, the dihedral angle between the aromatic ring and the hydrazine (NH—N=C) grouping is 52.2 (3)°. The butanedioate groups exhibit planar conformations. An intra­molecular N—H...O hydrogen bond links the N—H group of the hydrazine to one of the meth­oxy groups of the butane­dioate moiety. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds and π–π inter­actions are also observed [centroid–centroid separation = 3.535 (1) Å].

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In the title compound, C18H14N2O, the dihedral angle between the methyl­phenyl ring and the phthalazone ring system (r.m.s. deviation = 0.034 Å) is 53.93 (9)°. In the crystal, mol­ecules are connected by C—H...O hydrogen bonds, forming chains along [101]. The chains are linked by π–π inter­actions [centroid–centroid distance 3.6990 (12) Å], forming layers parallel to (10-1).

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In the title compound, C18H21N3O2, the dihedral angle between the benzene rings is 68.85 (11)°. In the crystal, the mol­ecules are linked by C—H...O and N—H...O hydrogen bonds, as well as weak C—H...π contacts, forming a three-dimensional supra­molecular architecture.

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In the title compound, C30H40FNO3, the dihedral angle between the benzene rings is 57.76 (7)°. The alkyl chain adopts an all-trans conformation. In the crystal, mol­ecules are linked by pairs of C—H...O hydrogen bonds, forming inversion dimers.
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