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In the title compound, C20H22N2O3·0.25H2O, the water molecule (occupancy 0.25) is disordered across a crystallographic inversion center. The dihedral angle between the hydroxyphenyl ring and the benzimidazole ring system is 59.31 (9)°. In the crystal structure, molecules are connected by intermolecular O—HN and C—HO hydrogen bonds. The crystal structure is further stabilized by a weak C—Hπ interaction involving the imidazole ring.
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The title compound, C20H17N3O2·CH4O·H2O, was synthesized by the condensation reaction of 2-benzyloxybenzaldehyde with isoniazid (isonicotinic acid hydrazide). The tricyclic compound displays a trans configuration with respect to the C=N double bond. The central benzene ring makes dihedral angles of 8.83 (7) and 70.39 (8)° with the pyridine ring and the terminal benzene ring, respectively. The dihedral angle between the pyridine ring and the terminal benzene ring is 73.11 (8)°. In the crystal structure, molecules are connected by intermolecular N—HO, O—HO, O—H(N,N) and C—HO hydrogen bonds, forming a two-dimensional network perpendicular to the a axis.
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In the title compound, C32H30N2O7, the piperidone ring adopts a chair conformation and the five-membered ring of the dihydroindenone ring system adopts an envelope conformation. Intramolecular O—HN and C—HO hydrogen bonds occur. The dihedral angle between the two hydroxy-subsituted methoxyphenyl rings is 71.12 (5)°. In the crystal structure, molecules are connected by intermolecular O—HO hydrogen bonds, forming layers parallel to (001). These layers are further connected by C—HO hydrogen bonds, forming a three-dimensional network.
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The asymmetric unit of the title compound, C5H5ClN2·0.5C4H4O4, comprises a neutral 2-amino-5-chloropyridine molecule and one half of a fumaric acid molecule which lies on an inversion center. The dihedral angle between the pyridine ring and the plane formed by the fumaric acid molecule is 3.22 (8)°. The 2-amino-5-chloropyridine molecule is planar, with a maximum deviation of 0.004 (1) Å for the pyridine N atom. In the crystal, the 2-amino-5-chloropyridine molecules interact with the carboxyl groups of fumaric acid molecules through N—HO and O—HN hydrogen bonds, forming centrosymmetric R22(8) ring motifs and another N—HO hydrogen bond links these motifs into a two-dimensional network parallel to (100).
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In the crystal structure of the title salt, C5H6ClN2+·C7H5O3−, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms via a pair of N—HO hydrogen bonds, forming R22(8) ring motifs. These motifs are centrosymmetrically paired via N—HO hydrogen bonds, forming a complementary donor–donor–acceptor–acceptor (DDAA) array. A typical intramolecular O—HO hydrogen bond is also observed in the salicylate anion. The crystal structure is further stabilized by weak C—Hπ interactions.
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The asymmetric unit of the title compound, C6H9N2+·C6H4NO2−·0.63H2O, contains two crystallographically independent 2-amino-5-methylpyridinium cations, a pair of picolinate anions and two water molecules, one with an occupancy of 0.25. Both the 2-amino-5-methylpyridine molecules are protonated at the pyridine N atoms. In the crystal structure, the cations, anions and water molecules are linked via N—HO, N—HN and O—HO hydrogen bonds, as well as by C—HO contacts, forming a chain along the b axis. In addition, weak π–π interactions are observed between pyridinium rings, with centroid–centroid distances of 3.5306 (13) Å.
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In the title compound, C32H26Cl2N2O3, the piperidone ring adopts a chair conformation and the proline and pyrrolidine rings adopt envelope conformations. The indane ring system is essentially planar with an r.m.s. deviation of 0.011 Å for the non-H atoms. The dihedral angle between the two chloro-substituted benzene rings is 63.69 (10)°. Intramolecular C—HO and N—HO hydrogen bonds may influence the molecular conformation. In the crystal structure, molecules are connected into layers by weak intermolecular C—HO hydrogen bonds.
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In the title molecular salt, C6H9N2+·C3H3O4−, the cation is essentially planar, with a maximum deviation of 0.010 (3) Å. In the anion, an intramolecular O—HO hydrogen bond generates an S(6) ring and results in a folded conformation. In the crystal, the protonated NH group and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms of the anion via a pair of N—HO hydrogen bonds, forming an R22(8) ring motif. Weak intermolecular C—HO interactions help to further stabilize the crystal structure.
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In the title compound, C15H8N2O, the fused ring system is approximately planar, with a maximum deviation of 0.039 (1) Å. In the crystal, weak intermolecular C—HO interactions help to establish the packing.
organic compounds
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The title salt, C5H6ClN2+·C3H3O4−, contains two cations and two anions in the asymmetric unit. Both 2-amino-5-chloropyridinium ions are protonated at their pyridine N atoms and both hydrogen malonate ions feature an intramolecular O—HO hydrogen bond, which generates an S(6) ring motif and results in a folded conformation. In the crystal structure, the cations and anions are linked via N—HO, O—HO and C—HO hydrogen bonds, forming chains propagating in [010], which are cross-linked by further C—HO interactions.