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Two 4,4′-[1,3-phenyl­enebis(­oxy)]dibenzoate anions bridge two 1,10-phenanthroline-chelated ZnII cations about a center of inversion to generate the dinuclear title compound, [Zn2(C20H12O6)2(C12H8N2)2]·2H2O. The geometry about the ZnII atom is a distorted octa­hedron. In the crystal, the mol­ecules are connected by classical O—H...O hydrogen bonds, weak C—H...O hydrogen bonds and C—H...π inter­actions, forming a three dimensional network. π–π stacking is also observed between aromatic rings of adjacent mol­ecules, centroid–centroid distances are 3.753 (2), 3.5429 (16) and 3.5695 (17) Å.

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In the title salt, [Zn(C6H15NO3)2](C8H4O4), the ZnII cation, located on a centre of inversion, is coordinated by four O atoms and two N atoms from two tridentate 2-[bis­(2-hy­droxy­eth­yl)amino]­ethanol (BHEA) ligands, giving rise to a slightly distorted octa­hedral geometry. The terephthalate dianion, located about a centre of inversion, is not coordinated to ZnII but is connected through O—H...O contacts with [Zn(BHEA)2]2+ cations, leading to a three-dimensional crystal structure.

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In the title salt, [Cd(C6H15NO3)2](C8H4O4), the Cd2+ cation is coordinated by six O atoms and two N atoms from two tetra­dentate 2-[bis­(2-hy­droxy­eth­yl)amino]­ethanol ligands, displaying a distorted square-anti­prismatic coordination. The terephthalate dianion does not coordinate to the cation but is connected through O...H—O hydrogen bonds of medium strength to the complex cations, leading to a layered structure extending parallel to (100).

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The mol­ecular components of the title salt, [Cu(C4H11NO2)2](C8H4O4), are one CuII 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 CuII 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.

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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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