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In the title compound, C18H18Cl2N2, the complete molecule is generated by the application of C2 symmetry. The C=N bond has an E configuration. The dihedral angle between the benzene ring and the 1,4-diaza­butadiene plane is 66.81 (9)°.

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In the title chalcone derivative, C20H22O6, the dihedral angle between the mean planes of the benzene rings is 15.77 (6)°. The H atoms of the central C=C double bond are in a trans configuration. There are a number of C—H...O interactions and a C—H...π interaction present in the crystal structure.

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The title compound, C40H32N2, has crystallographic twofold rotation symmetry, with two C atoms lying on the axis. The dihedral angle between the two benzene rings of the 4-phenyl-2,6-dimethyl­phenyl group is 35.74 (17)°. The acenaphthene ring makes an angle of 76.93 (11)° with the benzene ring bonded to the N atom and an angle of 41.53 (13)° with the other benzene ring.

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The mononuclear title complex, [Ti(C2H6N)2(C12H11N2)2], was synthesized by the reaction of 1-phenyl-N-[(pyrrol-2-yl)methyl­idene]methanamine with Ti(NMe2)4. The TiIV atom is coordinated in a distorted octa­hedral geometry by four N atoms from two derivatized methanamine ligands and two N atoms from two dimethyl­amide ions. The dihedral angles between the pyrrole and phenyl rings in the bidentate ligands are 62.36 (9) and 78.32 (8)°. In the crystal, a weak π–π stacking inter­action [centroid–centroid distance = 3.864 (2) Å] involving centrosymmetrically related mol­ecules is observed.

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In the binuclear title compound, [Cu2(C8H4O4)Cl(C10H8N2)2(H2O)3]NO3·H2O, the two crystallographically independent CuII ions have similar coordination environments. One of the CuII ions has a square-pyramidal arrangement, which is defined by a water mol­ecule occupying the apical position, with the equatorial ligators consisting of two N atoms from a 2,2′-bipyridine mol­ecule, one carboxyl­ate O atom from a terephthalate ligand and one O atom from a water mol­ecule. The other CuII ion has a similar coordination environment, except that the apical position is occupied by a chloride ligand instead of a water mol­ecule. An O—H...O and O—H...Cl hydrogen-bonded three-dimensional network is formed between the components.

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In the crystal of the title compound, C10H11NO4, the hy­droxy group forms an O—H...Ocarbon­yl hydrogen bond with an adjacent molecule, so forming chains which extend along (010). Further weak C—H...O hydrogen-bonding associations give an infinite three-dimensional network structure.

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The asymmetric unit of the title compound, C6H7NO3, contains two mol­ecules (A and B) related by a non-crystallographic twofold pseudo-axis. The mol­ecules are joined in the (AABB)n manner by O—H...O hydrogen bonds between their hy­droxy groups, thus forming C(2) chains along the a-axis direction. Neighboring mol­ecules of the same kind (A and A, or B and B) are related by inversion centers, so that all hy­droxy H atoms are disordered other two sets of sites with half occupancies (superimposed O—H...O and O...H—O fragments). The mol­ecules are further linked by C—H...O inter­actions, which can be considered to be weak hydrogen bonds.

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In the title compound, {[Cd(C9H5BrO4)(C10H8N2)(H2O)]·H2O}n, the CdII atom has a distorted octa­hedral coordination geometry. Two N atoms from two 4,4′-bipyridine (bipy) ligands occupy the axial positions, while the equatorial positions are furnished by three carboxyl­ate O atoms from three 3-bromo-2-(carboxyl­atometh­yl)benzoate (bcb) ligands and one O atom from a water mol­ecule. The bipy and bcb ligands link the CdII atoms into a three-dimensional network. O—H...O hydrogen bonds and π–π inter­actions between the pyridine and benzene rings [centroid–centroid distance = 3.736 (4) Å] are present in the crystal.

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In the title coordination polymer, [PbBr(C6H5N2O2)(H2O)]n, the PbII atom is coordinated by one pyrazine N atom, two bridging Br atoms, a water mol­ecule and three carboxyl­ate O atoms. Bridging by the two anions generates a layer structure parallel to (001); the layers are linked by O—H...N and O—H...Br hydrogen bonds, forming a three-dimensional network. The lone pair is stereochemically active, resulting in a Ψ-dodeca­hedral coordination environment for PbII.

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In the title mol­ecule, C20H22F3N3OS, the piperazine ring has a chair conformation, and the N—C(=O)—C—N torsion angle is −59.42 (14)°. In the crystal, weak C—H...O and C—H...π inter­actions link the mol­ecules into layers parallel to (101).

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The asymmetric unit of the title compound, C18H18N2O2, consists of two independent mol­ecules, each of which is located about a center of inversion. The mol­ecules are not planar, showing dihedral angles of 55.84 (9) and 54.10 (8)° between the piperazinedione and the aromatic rings. The piperazine N atoms exhibit a planar configuration. The crystal packing is stabilized by inter­molecular C—H...O hydrogen bonds.

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There are two independent mol­ecules in the asymmetric unit of the title compound, C19H19NO4. The indole unit in each mol­ecule is essentially planar, with mean deviations of 0.017 (1) and 0.013 (1) Å and forms dihedral angles of 50.17 (7) and 26.05 (6)° with the phenyl ring. In the crystal, mol­ecules are linked by weak C–H...π inter­actions.

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The asymmetric unit of the title structure, C28H19NO·0.5C3H6O, comprises one 2-(anthracen-9-yl)-10-meth­oxy­benzo[h]­quinoline mol­ecule and an acteone mol­ecule with an occupany of 0.5. The solvent mol­ecule is disordered around a centre of symmetry. Its occupancy was determined from NMR data and kept fixed during the refinement. The two conjugated ring systems of the mol­ecule are almost perpendicular to each other; the inter­planar angle between the anthracene and quinoline ring systems is 84.9 (2)°.

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In the title compound, C25H17NO4, the indolizine fused naphthaquinone unit is approximately planar [r.m.s deviation = 0.0678 Å] and makes a dihedral angle of 57.82 (5)° with the benzene ring of the meth­oxy­benzene group. The naphtho­quinone O atoms deviate, in the same sense, from the mean plane of the fused six-membered rings by 0.2001 (14) and 0.0516 (14) Å. In the crystal there is π–π stacking of inversion-related pairs of mol­ecules [inter­planar spacing = 3.514 (2) Å].

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In the title compound, C17H12ClNO2, the naphtho­quinone system is essentially planar [maximum deviation = 0.078 (2) Å] and makes a dihedral angle of 52.38 (7)° with the benzene ring. The crystal structure features N—H...O inter­actions.
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