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In the crystal structure of the title salt, C6H8N+·C7H5O3, the anions and cations are linked by classical N—H...O hydrogen bonds. The anions are connected by pairs of C—H...O hydrogen bonds into inversion dimers and further linked by classical O—H...O hydrogen bonds. Weak π–π inter­actions [centroid–centroid distances = 3.740 (3) and 3.855 (3) Å] also occur. The dihedral angle between the CO2 group and the benzene ring to which it is attached is 20.95 (8)°.

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In the title mol­ecule, C10H12O3, all non-H atoms lie in a common plane (r.m.s deviation = 0.010 Å). The mol­ecular conformation is stabilized by an intra­molecular O—H...O hydrogen bond.

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The title compound, [Cu4Cl8(C6H14N4O2)4], contains four mol­ecules in the asymmetric unit. In the mol­ecular structure, each of the four Cu2+ ions binds to three Cl atoms, one N atom and one O atom, resulting in distorted square-pyramidal coordination environments. The molecular structure is stabilized by weak C—H...O and N—H...Cl hydrogen bonds. The crystal structure exhibit weak inter­molecular N—H...O, C—H...O and N—H...Cl inter­actions, generating a three-dimensional network.

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In the polymeric title compound, [Ba(NO3)2(C6H9N3O2)2]n, the BaII atom is located on a crystallographic twofold axis and is coordinated by ten O atoms. Six are derived from two zwitterionic L-histidine mol­ecules that simultaneously chelate one BaII atom and bridge to another. The remaining four O atoms are derived from two chelating nitrates. The mol­ecules assemble to form a chain along [010]. In the crystal, chains are linked via N—H...O and N—H...N hydrogen bonds, generating a three-dimensional network.

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In the title binuclear copper(II) complex, [Cu2(ClO4)2(OH)2(C10H8N2)2], the CuII ion is coordinated in the form of a Jahn–Teller distorted octahedron by two bi­pyridine N atoms, two perchlorate O atoms and two hydroxide O atoms, and displays a distorted octa­hedral geometry. The mol­ecule belongs to the symmetry point group C2h. The CuII ion is located on a twofold rotation axis and the hydroxide and perchlorate ligands are located on a mirror plane. Within the dinuclear mol­ecule, the Cu...Cu separation is 2.8614 (7) Å. The crystal structure exhibits O—H...O, C—H...O and π–π [centroid–centroid distance = 3.5374 (13) Å] inter­actions.

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In the cation of the title salt, C23H27N2O4+·C2HO4·2H2O, both fused pyrrolidine rings exhibit twisted conformations, while the piperidine rings adopt screw-boat and boat conformations. In the crystal, the three components are linked via O—H...O and N—H...O inter­actions, forming a tape along the b axis. The tapes are further linked by weak C—H...O hydrogen bonds. forming a three-dimensional network.

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In the cation of the title compound, C14H13BrN+·C7H7O3S, the dihedral angle between the benzene and pyridine rings is 8.34 (11)°. The Br atom is disordered over two positions with site occupancies of 0.74 (2) and 0.26 (2). The mol­ecular structure is stabilized by a weak intra­molecular C—H...O inter­actions. The crystal structure exhibits weak C—H...O and π–π [centroid–centroid distance = 3.7466 (17) Å] inter­actions, forming a three dimensional network.

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In the title mol­ecular salt, C18H22NO+·C7H7O3S, the dihedral angle between the aromatic rings in the cation is 10.00 (9)°; its alkyl side chain adopts an extended conformation. In the crystal, weak C—H...O and π–π [centroid–centroid distance = 3.7658 (17) Å] inter­actions link the components, generating a three-dimensional network.

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The asymmetric unit of the title salt, C3H7N6+·C6H7O4·C3H4O2·H2O, contains a 2,4,6-tri­amino-1,3,5-triazin-1-ium cation, a 3-(prop-2-eno­yloxy)propano­ate anion and acrylic acid and water solvent mol­ecules in a 1:1:1:1 ratio and with each species in a general position. In the crystal, the components are linked into a supra­molecular layer in the bc plane via a combination of O—H...O, N—H...N and N—H...O hydrogen bonding. The crystal studied was a non-merohedral twin, the minor component contribution being approximately 26%.

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In the title salt, C8H12N+·C7H5O3, the cation is disordered over two orientations with site occupancies of 0.565 (7) and 0.435 (7). In the anion, the carboxyl­ate group makes the dihedral angle of 4.19 (18)° with the benzene ring. In the crystal, the ions are connected by N—H...O and O—H...O hydrogen bonds, forming a three-dimensional network.

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The asymmetric unit of the title compound, C3H6N6·2C6H5NO3, contains one melamine and two 3-nitro­phenol mol­ecules. The mean planes of the 3-nitro­phenol mol­ecules are almost orthogonal to the plane of melamine, making dihedral angles of 82.77 (4) and 88.36 (5)°. In the crystal, mol­ecules are linked via O—H...N, N—H...N and N—H...O hydrogen bonds, forming a three-dimensional network. The crystal also features weak C—H...π and π–π inter­actions [centroid–centroid distance = 3.9823 (9) Å].

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The mol­ecular structure of the title compound, C16H16N2O2, is stabilized by intra­molecular O—H...N hydrogen bonds with S(6) graph-set motifs, so that the mol­ecule is almost planar, with a C=N—N=C torsion angle of −179.7 (2)° and a dihedral angle of 1.82 (12)° between the aromatic rings. In the crystal, weak C—H...π inter­actions lead to the formation of a three-dimensional network.

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In the title compound, C22H16ClNO, the quinoline ring system makes dihedral angles of 56.30 (6) and 7.93 (6)°, respectively, with the adjacent phenyl and benzene rings. The dihedral angle between these phenyl and benzene rings is 56.97 (8)°. In the crystal, weak C—H...π and π–π [centroid–centroid distances of 3.7699 (9) and 3.8390 (9) Å] inter­actions link the mol­ecules into a layer parallel to the ab plane.

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The asymmetric unit of the title compound, C6H5N3·C7H6O3, comprises independent benzotriazole and 4-hydroxybenzoic acid molecules. The dihedral angle between the benzene ring and the benzotriazole ring system is 15.18 (7)°. The mean plane of the carb­oxyl group is twisted at an angle of 18.55 (1)° with respect to the benzene ring. The crystal structure is stabilized by weak inter­molecular N—H...N, O—H...N, O—H...O and C—H...O inter­actions, forming a three-dimensional network.

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In the title hydrated salt, C6H7N2O2+·C7H5O6S·H2O, the benzene ring of the cation makes a dihedral angle of 1.32 (19)° with the attached nitro group. In the anion, an intra­molecular O—H...O hydrogen bond with an S(6) ring motif is formed between the carb­oxyl and hy­droxy groups; the dihedral angle between the carb­oxyl group and the benzene ring is 8.76 (8)°. The crystal structure exhibits inter­molecular N—H...O, O—H...O, C—H...O, and π–π [centroid–centroid distances = 3.6634 (9) and 3.7426 (9) Å] inter­actions to form a three-dimensional network.

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In the title compound, CH5N2O+·C7H5O6S, the dihedral angle between the benzene ring and the mean plane of the uronium cation is 76.02 (8)°. The carboxyl group in the anion is twisted by 1.47 (9)° from the benzene ring. In the crystal, the cation is linked to the anion by weak O—H...O and N—H...O hydrogen bonds and π–π inter­actions [centroid–centroid distance = 3.8859 (8) Å], forming a three-dimensional network.

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In the title compound, C25H19FN2O5S, the substituted phenyl ring makes a dihedral angle of 12.26 (9)° with the indole ring system. The nitro group is twisted at an angle of 26.92 (8)° out of the plane of the ring to which it is attached. The mol­ecular structure is stabilized by weak C—H...O hydrogen bonds. In the crystal, weak C—H...O, C—H...F and π–π [centroid–centroid distance = 3.6645 (11) Å] inter­actions link the mol­ecules, forming a three-dimensional network.

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In the title compound, C18H16ClNO2S, the indole ring system forms a dihedral angle of 75.07 (8)° with the phenyl ring. The mol­ecular structure is stabilized by a weak intra­molecular C—H...O hydrogen bond. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds, forming a chain along [10-1]. C—H...π inter­actions are also observed, leading to a three-dimensional network.

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In the title compound, C25H19ClN2O5S, the phenyl ring forms dihedral angles of 79.62 (12) and 80.02 (13)° with the indole ring system and the benzene ring, respectively. The nitro group is twisted at an angle of 22.39 (11)° with respect to the attached benzene ring. In the crystal, mol­ecules assemble into double layers in the ab plane via C—H...O inter­actions.

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In the title compound, C18H16BrNO3S, the dihedral angle between the phenyl ring and the indole ring system is 89.91 (11)°. The mol­ecular structure features weak C—H...O and C—H...Br hydrogen bonds. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds, forming chains along the a-axis direction. The chains are further linked by C—H...π inter­actions, forming a layer parallel to the ab plane.
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