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In the title compound, C21H23N3O2, the indolin-2-one group is essentially planar, with a maximum deviation of 0.016 (2) Å for the N atom, and makes a dihedral angle of 84.38 (14)° with the benzene ring. The =N—N(H)—C(=O)—C– torsion angle is 0.9 (3)°. In the crystal, mol­ecules are linked into a three-dimensional network via N—H...O and C—H...O hydrogen bonds. In addition, a C—H...π inter­action was observed.

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In the title compound, C21H20N2O4, the naphthalene ring system makes a dihedral angle of 84.5 (3)° with the benzene ring, and the –C(=O)–N(H)–N(H)–C(=O)– torsion angle is 70.7 (7)°, so that the mol­ecule is twisted. An S(6) ring motif is formed via an intra­molecular O—H...O hydrogen bond. In the crystal, mol­ecules are linked by N—H...O and C–H...O hydrogen bonds into supra­molecular layers in the ab plane.

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In the title compound, C18H17ClN2O2·C3H6O, the 4H-pyran ring is nearly planar [maximum deviation = −0.108 (1) Å] and the cyclo­hexene ring is puckered [puckering parameters QT = 0.4596 (17) Å, θ = 55.9 (2)° and φ = 226.5 (3)°]. The 4H-pyran ring is approximately perpendicular to the benzene ring [dihedral angle = 84.35 (7)°] and is almost coplanar with the mean plane of the cyclo­hexene ring [dihedral angle = 8.64 (7)°]. In the crystal, inversion-related main mol­ecules are linked into dimers by pairs of N—H...N hydrogen bonds, generating an R22(12) graph-set motif. These dimers are further connected by N—H...O and C—H...N hydrogen bonds, forming a layer structure extending parallel to the (011) plane. In addition, the mol­ecules within the layers inter­act with each other via C—H...π inter­actions.

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In the title compound, C21H24N4O2, inversion-related mol­ecules are linked into dimers through pairs of N—H...O hydrogen bonds, which generate R22(8) motifs. As well as dimer formation, an additional N—H...O hydrogen bond and two C—H...π contacts, involving H atoms from the phenyl ring and the pyrrole and benzene rings of the indole system, generate a three-dimensional network.

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The 4H-pyran ring of the title compound, C17H16N2O2, is nearly planar [maximum deviation = 0.077 (2) Å] and the cyclo­hexene ring adopts a flattened chair conformation [puckering parameters: QT = 0.435 (2) Å, θ = 122.0 (3)° and φ = 53.5 (3)°]. The 4H-pyran ring is almost perpendicular to the benzene ring [dihedral angle = 87.23 (8)°] and is almost coplanar with the mean plane of the cyclo­hexene ring [dihedral angle = 8.01 (8)°]. In the crystal, inversion-related mol­ecules are linked by pairs of inter­molecular N—H...N hydrogen bonds, forming inversion dimers with R22(12) ring motifs. These dimers are further connected by N—H...O and C—H...N hydrogen bonds, forming a layer structure extending parallel to (0-12). Mol­ecules within the layers inter­act with each other via C—H...π inter­actions.

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The title compound, C20H23BrN2O2, containing an ibuprofen core, crystallizes with three independent mol­ecules of similar conformation in the asymmetric unit. In these three mol­ecules, the two benzene rings make dihedral angles of 82.7 (2), 71.2 (2) and 78.0 (3)° with respect to each other. The atoms of the isobutyl groups in two of the mol­ecules are disordered over two positions, with site-occupancy ratios of 0.516 (8):0.484 (8) and 0.580 (8):0.420 (8). In the crystal, mol­ecules are linked by N—H...O, C—H...O and O—H...N hydrogen bonds. Furthermore, C—H...π inter­actions are also observed.

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In the title 1:1 cocrystal, C10H7NO4·C14H13N3O2, mol­ecules are linked by inter­molecular C—H...O, N—H...O and O—H...N hydrogen bonds, forming a three-dimensional network. In addition, π–π stacking inter­actions [with centroid–centroid distances of 3.5723 (19) and 3.6158 (18) Å] are observed.

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In the crystal structure of the title compound, 2C10H7NO4·C14H13N3O2, the two independent acid mol­ecules are connected through strong O—H...N and O—H...O hydrogen bonds to the central mol­ecule of the anti­tubercular drug N′-[(E)-4-meth­oxy­benzyl­idene]pyridine-4-carbohydrazide. Two such trimolecular units related by an inversion centre inter­act through a pair of N—H...O hydrogen bonds, forming a 3 + 3 mol­ecular aggregate. The dihedral angle between the aromatic rings of the hydrazone mol­ecule is 1.99 (12)°. The crystal packing features weak C—H...O and π–π stacking inter­actions, with centroid–centroid distances of 3.8460 (19) and 3.8703 (13) Å.
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