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The title compound, C10H13N3O3, adopts an E conformation with respect to the azomethine bond and crystallizes in the amide form. A classical intra­molecular O—H...N hydrogen bond is present. The two N atoms of the hydrazinecarboxamide unit are also involved in inter­molecular N—H...O hydrogen bonds, with the O atom of the hydrazinecarboxamide group acting as the acceptor. Pairs of N—H...O hydrogen bond link the mol­ecules into centrosymmetric dimers, which are linked by further N—H...O hydrogen bonds into chains along the b axis. The chains are linked by C—H...π inter­actions.

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The title compound, [CuCl2(C19H16N4O)], contains a CuII atom N,N′,O-chelated by a neutral N-phenyl­hy­dra­zine­car­box­amide ligand and additionally coordinated by two Cl atoms, resulting in a distorted square-pyramidal geometry. The ligating atoms in the basal square plane of the complex comprise the azomethine N, the pyridine N, the amide O and one of the Cl atoms, whereas the other Cl atom occupies an apical position. The apical Cl atoms in adjacent layers function as hydrogen-bond acceptors to both NH groups. Intermolecular C—H...Cl and C—H...O interactions are also observed.

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The title compound, C14H13N3O3·H2O, adopts an E conformation with respect to the azomethine bond and crystallizes in the amide form. An intra­molecular O—H...N hydrogen bond occurs. In the crystal, the lattice water molecule plays a major role in the supramolecular architecture by interconnecting adjacent molecules into a three-dimensional netwrok by means of O—H...O, O—H...N and N—H...O hydrogen-bonding inter­actions. The structure also features two non-classical C—H...O inter­actions.

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The title compound, C21H17N3O5·C3H7NO, exists in an E conformation with respect to the azomethine double bond of the hydrazide mol­ecule. This mol­ecule contains an intra­molecular O—H...N hydrogen bond, while an inter­molecular N—H...O hydrogen bond links the hydrazide to the formamide mol­ecule of solvation. Nonclassical C—H...O inter­molecular hydrogen bonds build up a supra­molecular architecture, together with two C—H...π inter­actions and a weak π–π inter­action, with a centroid–centroid distance of 3.650 (13) Å.

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In the title compound, C24H18S, the dihedral angles between the phenyl ring and the two benzene rings of the anthracene moiety are 51.92 (9) and 68.24 (9)°, whereas the dihedral angle between the two anthracene benzene rings is 120.13 (9)°. The three non-aromatic six-membered rings are in boat conformations, while the five-membered ring has an envelope conformation on the S atom. In the crystal, there are three C—H...π inter­actions, which facilitate the packing of the mol­ecules.

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The phenyl and tert-butyl groups of the title compound, C27H25NO3, exhibit a trans configuration in agreement with the stereochemistry of the Z phenyl-N-tert-butyl­nitrone starting material. The attached carbonyl groups are not coplanar with the neighboring di­hydro­isoxazole ring and the phenyl rings they are bonded to, with torsion angles of 59.26 (8), 17.53 (11), 16.52 (12) and 52.86 (7)°. The dihedral angle between the di­hydro­isoxazole ring and the directly attached phenyl group is 86.86 (8)°. There are two nonclassical inter­molecular C—H...O hydrogen-bonding inter­actions that operate together with an inter­molecular C—H...π inter­action to form a supramolecular architecture in the crystal system.

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In the title compound, C12H11N3O3·2H2O, the dihedral angle formed by the planes of the pyridine and the furan rings of the organic carbohydrazide mol­ecule is 4.66 (7)°. In the crystal, these mol­ecules form stacks along the b-axis direction, neighbouring mol­ecules within each stack being related by inversion and the shortest distance between the centroids of the pyridine and furan rings being 3.714 (1) Å. Mol­ecules from neighboring stacks are linked by pairs of N—H...O hydrogen bonds. The water mol­ecules fill the channels between the stacks being linked by O—H...O hydrogen bonds into helices along [010]. Besides this, water mol­ecules are involved in O—H...N and O—H...O hydrogen bonds with the carbohydrazide mol­ecules, thus forming a three-dimensional network, augmented by weak C—H...O interactions.

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The title compound, C15H12N4O, adopts an E conformation with respect to the azomethine bond and crystallizes in its hydrazinyl­idene tautomeric form. The dihedral angle between the ring systems is 15.98 (7)°. The phenol O—H group forms an intra­molecular O—H...N hydrogen bond. In the crystal, pairs of N—H...N and C—H...O hydrogen bonds link neighbouring mol­ecules into centrosymmetric dimers. These dimers are inter­connected by means of three types of π–π stacking inter­actions. One, with a centroid–centroid distance of 3.577 (1) Å [inter­planar separation = 3.4673 (6) Å], connects adjacent mol­ecules into centrosymmetric dimers. The other two inter­actions, on the outward facing sides of the dimers, are between phenol rings of neighboring mol­ecules [centroid–centroid separation = 3.7907 (13) Å and inter­planar separation = 3.5071 (8) Å], and between phthalazin units [centroid–centroid separation = 3.6001 (12) Å and inter­planar separation = 3.4891 (7) Å]. In combination, the π–π inter­actions lead to the formation of infinite layers with mol­ecules stacked along [0-11]. These layers are, in turn, connected with neighbouring layers through the N—H...N and C—H...O hydrogen bonds, yielding a three-dimensional supra­molecular architecture.

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The title compound, C15H13N3O3, exists in the E conformation with respect to the azo­methane C=N double bond. The pyridyl and phenyl rings form dihedral angles of 35.67 (8) and 36.65 (7)°, respectively with the central C(=O)N2C unit. In the crystal, N—H...O and C—H...O hydrogen bonds connect the mol­ecules into chains along the b axis. Another C—H...O inter­action connects mol­ecules along the c-axis direction, forming layers.

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The title azine mol­ecule, C28H24N2O4, lies about a center of inversion. The dihedral angle between the phenyl ring and the hy­droxy-substituted ring is 70.3 (5)°. The phenolic O-H group forms an intra­molecular hydrogen bond to the azine N atom.

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The title compound, C15H13BrN2O3·H2O, exists in an E conformation with respect to the azo­methane C=N double bond. The benzene and phenyl rings form dihedral angles of 0.46 (2) and 4.90 (3)°, respectively with the central C(=O)N2C unit. An intra­molecular O—H...N hydrogen bond occurs. In the crystal, some hydrazide mol­ecules are replaced by mol­ecules of the 6-bromo isomer. The Br atom from this admixture was refined to give a partial occupancy of 0.0443 (19). A supra­molecular network is built in the lattice by means of inter­molecular N—H...O and two O—H...O inter­actions together with non-classical C—H...O inter­actions involving the lattice water mol­ecule stacking the mol­ecules along the b-axis direction.

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The asymmetric unit of the title compound, C14H11FN2O, contains two independent mol­ecules, both of which adopt the E conformation with respect to the azomethine C=N bond. The mol­ecules are non-planar, with dihedral angles of 26.92 (12) and 11.36 (11)° between the benzene and phenyl rings. In the crystal, mol­ecules are linked through N—H...O=C and N—H...N hydrogen bonds into chains along [101]. C—H...O contacts link these chains into layers parallel to (001). The three-dimensional crystal packing is stabilized by π–π inter­actions, the shortest separation between the centroids of benzene rings being 3.884 (1) Å.
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