Crystal structure of bis­{2-[(2-hy­droxy­eth­yl)amino]­ethanol-κ³O,N,O′}copper(II) terephthalate

The mol­ecular components of the title salt, [Cu(C₄H₁₁NO₂)₂](C₈H₄O₄), are one Cu^II cation O,N,O′-chelated by two tridentate 2-[(2-hy­droxy­eth­yl)amino]­ethanol ligands, and a terephthalate counter-dianion, located about a centre of inversion. The complex Cu^II cation is located about a centre of inversion and shows typical Jahn–Teller distortion, with two short Cu—O and two short Cu—N bonds in the equatorial plane and two long Cu—O bonds to the axial atoms. The cations are arranged in sheets parallel to (100), with the centrosymmetric terephthalate anions located between the sheets. Each anion is the acceptor of four O—H...O and two N—H...O hydrogen bonds, forming a three-dimensional network structure.

Crystal structure of poly[[μ₃-4,4′-(4,4′-bipyridine-2,6-diyl)dibenzoato]{μ₂-4-[6-(4-carboxyphenyl)-4,4′-bipyridin-4′-ium-2-yl]benzoato}manganese(II)] hemi­hydrate]

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.