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T.-T. Pan and D.-J. Xu

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The title compound consists of two quinolinium cations and an MnBr4 anion, which exhibits a distorted tetra­hedral coordination geometry.

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The asymmetric unit of the title hybrid compound, (C9H8N)[FeCl4]Cl, comprises a tetra­hedral tetra­chlorido­ferrate(III) anion, [FeCl4], a Cl anion and two quinolinium cations. There are N—H...Cl hydrogen-bonding inter­actions between the protonated N atoms of the quinolinium cations and the chloride anion, which together with π–π stacking between adjacent quinolinium rings [centroid-to-centroid distances between C6 and C5N rings in adjacent stacked quinolinium cations of 3.609 (2) and 3.802 (2) Å] serve to hold the structure together.

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In the anion of the title hydrated mol­ecular salt, C9H8N+·C8H4NO6·H2O, the protonated carboxyl and nitro groups makes dihedral angles of 27.56 (5) and 6.86 (8)°, respectively, with the attached benzene ring, whereas the deprotonated carb­oxy group is almost orthogonal to it with a dihedral angle of 80.21 (1)°. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds, generating [001] chains. The packing is consolidated by weak C—H...N and C—H...O inter­actions as well as aromatic π–π stacking [centroid-to-centroid distances: 3.7023 (8) & 3.6590 (9)Å] inter­actions, resulting in a three-dimensional network.

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In the title salt, each cation shows a moderate distortion between the planes of the amide groups and the quinolinium rings. The tri­fluoro­methane­sulfonate anions are linked to organic cations via N—H...O hydrogen-bonding inter­actions involving the NH amide groups. In the crystal, weak C—H...O hydrogen bonds and π-stacking inter­actions between the quinolinium and phenyl rings link the organic cations into chains.

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A new mixed-valence CuI/CuII three-dimensional coordination polymer incorporating 2-(pyra­zin-2-yl)quinoline-4-carb­oxy­lic acid was synthesized and characterized. The ligand was also isolated as its hydrated hydro­chloride salt. The compounds show luminescence and the ligand structure was rationalized by means of quantum-chemical calculations.

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The results of combined use of experimental diffraction and spectroscopic techniques and theoretical approaches characterizing structure, properties and low-temperature phase transition of chalcogenazinoquinolinium monoiodides are reported here.

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The crystal structure of the title compound, C9H8N+·ClO4, consists of cations and anions linked by N—H...O and C—H...O hydrogen bonds to form layers parallel to the (102) plane.

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A salt co-crystal comprising pyridin-1-ium carb­oxy­formate and 2-chloro­acetic acid is stabilized by conventional and charge-assisted hydrogen bonds within a one-dimensional chain.

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The cations in the title salt show π-stacking. The chloride anions, together with the water mol­ecules, form hydrogen-bonded zigzag chains.

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In the cation of the title salt, C12H14N3O+·C24H20B, the dihedral angle between the quinoline ring and the mean plane of the urea fragment is 61.51 (5)°. In the crystal, the cations inter­act through weak C—H...O hydrogen bonding, forming a zigzag chain along the c-axis direction; the cations and anions are involved in weak inter­molecular C—H...π and N—H...π inter­actions as donors and acceptors, respectively.

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