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The title mol­ecule, C18H21Cl2NO3S2, contains one chiral carbon center and the absolute sterochemistry has been confirmed as as R. An intra­molecular N—H...O hydrogen bond occurs and the dihedral angle between the benzene rings is 64.5 (1)°. In the crystal, the mol­ecules are linked by weak C—H...O hydrogen bonds, forming a zigzag chain structure extending along the c-axis direction.

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In the title compound, [Fe(C5H5)(C9H6ClN2)], the two cyclo­penta­dienyl rings are almost parallel, subtending a dihedral angle of 3.01 (5)°. The dihedral angle between the substituted cyclo­penta­dienyl ring and the pyrimidinyl ring is 12.02 (1)°. The conformation of the two cyclopentadienyl rings in the ferrocenyl moiety is eclipsed.

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In the title compound, C11H9NO3, the dihedral angle between the isoxazole and phenyl rings is 19.79 (12), while the ester group is inclined to the isoxazole group by 12.14 (6)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming layers lying parallel to (010).

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In the title compound, C11H9NO3, the dihedral angle between the isoxazole and phenyl rings is 19.79 (12), while the ester group is inclined to the isoxazole group by 12.14 (6)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming layers lying parallel to (010).

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In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, forming inversion dimers, which are linked by a further N—H...O hydrogen bond, forming chains along [100]. There are intra- and inter­molecular C—H...π inter­actions present, the latter linking the chains to form a three-dimensional supra­molecular structure.

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The title compound, {[Mn(C24H14N2O4)(C24H16N2O4)]·0.5H2O}n, was obtained by the reaction of manganese nitrate with the ligand 4,4′-(4,4′-bi­pyridine-2,6-di­yl) di­benzoic acid under hydro­thermal conditions. The water O atom is located on a twofold rotation axis. The Mn2+ ion is hepta­coordinated by six O atoms and one N atom from the ligands. In this structure, the ligands adopts two different forms, one completely deprotonated and one with a protonated N atom (pyridinium) and a carboxylic acid function. In the crystal, N—H...O and O—H...O hydrogen bonds consolidate the packing, forming a three-dimensional framework.

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The title coordination polymer, {[Co2(C15H7O7)(OH)(C14H14N4)]·0.25H2O}n, was synthesized under hydro­thermal conditions. The asymmetric unit contains two Co2+ ions, one L3− anion originating from 5-(4-carb­oxy­phen­oxy)isophthalic acid (H3L), one OH ligand, one 1,4-bis­[(1H-imidazol-l-yl)meth­yl]benzene (bix) ligand and one disordered lattice water mol­ecule (occupancy 0.25). The two Co2+ ions have different environments. One has an octa­hedral O4N2 coordin­ation sphere, defined by four O atoms from three carboxyl­ate groups and one OH ligand, and two N atoms from two symmetry-related bix ligands. The other has a trigonal-bipyramidal O5 coordination sphere resulting from three carboxyl­ate groups and two OH ligands. The dihedral angles between the two benzene rings in the L3− ligand and between the benzene ring and the two imidazole rings in the bix ligand are 67.05 (15), 75.27 (17) and 82.05 (17)°, respectively. Four neighbouring Co2+ ions are linked by six carboxyl­ate groups and two μ3-OH ligands, forming a butterfly-shaped secondary building unit (SBU). These SBUs are connected by L3− anions into layers parallel to (1-10). Adjacent layers are cross-linked by the bix ligands, forming a three-dimensional framework that has a bimodal (3,8)-connected tfz-d topology. The disordered lattice water mol­ecule is located in the voids of the framework and has O...O and O...N contacts of 2.81 (2) and 2.95 (2) Å, suggesting medium-strength hydrogen bonds. The title compound may be a good candidate for artificial eye lenses.

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In the title compound, C30H25N3O3, the central imidazole ring forms dihedral angles of 77.34 (6), 12.56 (6) and 87.04 (6)°, respectively, with the o-nitro­benzene ring and the phenyl substituents in the 5- and 4-positions. The mol­ecular conformation is stabilized by weak intra­molecular C—H...π inter­actions. In the crystal, mol­ecules are linked by O—H...N hydrogen bonds, forming chains running parallel to the b-axis direction.

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In the title mol­ecule, C14H18ClN5O2S, the six atoms of the 1,6-di­hydro­pyridazine ring are essentially coplanar (r.m.s. deviation = 0.008 Å), and the dihedral angle between this and the 1,3,4-thia­diazole ring is 62.06 (10)°. In the crystal, centrosymmetrically related mol­ecules are linked by inter­molecular C-H-O hydrogen bonding to form a supra­molecular dimer. The terminal ethyl group is statistically disordered over two positions.
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