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The title compound, C14H12N4O6·C3H7NO, was prepared by the reaction of 2-hydroxy-3-methoxy­benzaldehyde and 2,4-dinitro­phenyl­hydrazine in N,N-dimethyl­formamide. In the crystal structure, the molecule of 2-hydroxy-3-methoxy­benzaldehyde-2,4-dinitro­phenyl­hydrazone is approximately planar, with a mean deviation of non-H atoms from the plane of 0.109 Å. The crystal packing is stabilized by O—H...O and N—H...O hydrogen bonds and aromatic packing interactions.

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The title compound, C14H9F3N4O5S, was prepared from 4,4,4-tri­fluoro-1-(2-thienyl)­butane-1,3-dione and 2,4-di­nitro­phenyl­hydrazine. The crystal structure shows that strong intramolec­ular hydrogen bonding determines the conformation of the individual mol­ecules, while intermolecular hydrogen bonding and aromatic π-stacking interactions stabilize the structure in the solid state.

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The title compound, C19H19N3O3, was prepared from 4-hydr­oxy-3-methoxy­benzaldehyde and 4-amino-1,5-dimeth­yl-2-phenyl­pyrazolidin-3-one. The crystal structure shows that the molecules associate via intermolecular hydrogen bonds to form a supramolecular structure with a zigzag pattern.

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The title compound, C13H11N3O2, was prepared by the reaction of pyridine-4-carboxylic acid hydrazide and p-hydroxy­benzaldehyde in ethanol. In the crystal structure, all non-H atoms are coplanar, with an r.m.s. deviation of 0.096 Å. N—H...N, O—H...N and O—H...O inter­molecular hydrogen bonds stabilize the structure.

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Crystals of the title compound, C15H13N5O7, were obtained by a condensation reaction of 3-methoxy­acetophenone and 2,4,6-trinitro­phenyl­hydrazine. The mol­ecule adopts an E configuration about the C8=N5 bond. π-π stacking is observed between the methoxy­phen­yl and trinitro­phen­yl rings of neighbouring mol­ecules.

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The title compound, C14H13N3O2·H2O, was prepared from pyridine-4-carboxylic acid hydrazide and 4-methoxy­benzaldehyde. In the crystal structure, the water mol­ecules participate in O—H...O, O—H...N and N—H...O hydrogen bonds with the hydrazide mol­ecules; these inter­actions contribute to the stability of the structure.

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The title compound, C19H19N3O3, was prepared by the reaction of 2-hydr­oxy-3-methoxy­benzaldehyde (o-vanillin) and 4-amino-1,5-dimethyl-2-phenyl­pyrazol-3-one. The crystal structure shows that a strong intra­molecular O—H...N hydrogen bond stabilizes the conformation of the mol­ecule, while inter­molecular C—H...O hydrogen bonds give rise to a stable structure in the solid state.

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The title compound [alternative name: pyridine-2-carbaldehyde 2,4-dinitro­phenyl­hydrazone], C12H9N5O4, was prepared using pyridine-2-carbaldehyde and N-(2,4-dinitro­phen­yl)hydrazine. In the crystal structure, weak inter­molecular C—H...O hydrogen-bonding inter­actions link adjacent mol­ecules to form a three-dimensional supramolecular network.

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The components of the title solvate structure, C14H12N2O2·C3H7NO, are connected via N—H...O, O—H...N and O—H...O hydrogen bonds, leading to a chain motif.

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The title compound, C18H17N3O2, was prepared using 3-hydroxy­benzaldehyde and 4-amino-1,5-dimethyl-2-phenyl­pyrazolidin-3-one. The crystal structure of the title compound shows that inter­molecular O—H...O hydrogen-bonding inter­actions link adjacent mol­ecules and contribute to the stability of the structure in the solid state.

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The title compound, C18H19N3O3, was prepared using 4-hydroxy­benzaldehyde and 4-amino-1,5-dimethyl-2-phenyl­pyrazolidin-3-one. The crystal structure shows that the title compound includes a water mol­ecule, which forms O—H...O hydrogen bonds with adjacent mol­ecules and plays an important role in the stabilization of the crystal structure.

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The title compound, C19H20O6, is composed of two individual vanillin subunits bonded to a central chain of C atoms. The mol­ecule lies on a twofold rotation axis. The two aromatic rings are approximately perpendicular to each other and both make a dihedral angle of 53.36 (4)° with the backbone chain. A weak C—H...π inter­action consolidates the crystal packing.

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The title compound, C20H22O6, comprises two o-vanillin subunits covalently linked to a central butyl chain; the molecule lies on an inversion center. The dihedral angle between the bridging butyl group and the plane through the aromatic ring is 7.13 (14)°, indicating the overall planarity of the mol­ecule. The mol­ecules are linked by weak C—H...O hydrogen bonds.

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The molecule of the title compound, C21H17N5O8, is non-planar. The central benzene ring makes dihedral angles of 39.57 (10) and 2.93 (17)° with the two terminal benzene rings. An intra­molecular N—H...O hydrogen bond helps to establish the mol­ecular conformation.
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