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In the title compound, C15H13N5O, the morpholine ring adopts a chair conformation. The dihedral angle between the pyrrole ring and the pyridine ring is 28.93 (14)°. In the crystal, the molecules are linked by C—H...O hydrogen bonds occur, and aromatic weak π–π stacking [centroid–centroid separation = 4.178 (2) Å] and C—H...π inter­actions consolidate the packing.

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The piperidine ring of the title compound, C16H15N5, adopts a chair conformation. The pyridine ring is essentially planar, with a maximum deviation of 0.035 (3) Å. The pyrrole and pyridine rings are almost coplanar, forming a dihedral angle of 3.48 (14)°. In the crystal, no classical hydrogen bonds were found. In the crystal, the molecules are linked by aromatic π–π stacking [centroid–centroid separations = 3.4984 (16) and 3.9641 (15) Å between pyrrole and pyridine rings and between pyridine rings, respectively].

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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, 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 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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