Guanfang Su

Poly[diaqua-bis-[μ-1-hy-droxy-2-(imidazol-3-ium-1-yl)ethane-1,1-diyldiphospho-nato]tricopper(II)].

In the title coordination polymer, [Cu3(C5H7N2O7P2)2(H2O)2]n, one CuII atom is five-coordinated by five O atoms from three 1-hydroxy-2-(imidazol-3-ium-1-yl)ethane-1,1-diyldiphosphonate (L) ligands in a distorted square-pyramidal geometry. The other CuII atom, lying on an inversion center, is six-coordinated in a distorted octahedral geometry by four O atoms from two L ligands and two O atoms from two water molecules. The five-coordinated CuII atoms are linked by phosphonate O atoms of the L ligands, forming a polymeric chain. These chains are further linked by the six-coordinated Cu atoms into a layer parallel to (01). N—H⋯O and O—H⋯O hydrogen bonds connect the layers into a three-dimensional supramolecular structure.

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 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.

Crystal structure of bis­{2-[bis­(2-hy­droxy­eth­yl)amino]­ethanol-κ4O,N,O′,O′′}cadmium terephthalate

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.

catena-Poly[[[aqua­(1,10-phenanthro­line)zinc(II)]-μ-3,3′-(p-phenyl­ene)di­acrylato] hemihydrate]

In the title compound, {[Zn(C12H8O4)(C12H8N2)(H2O)]·0.5H2O}n, each ZnII atom is six-coordinated by two N atoms from one 1,10-phenanthroline (phen), three carboxylate O atoms from two different L ligands [H2 L = 3,3′-(p-phenylene)diacrylic acid] and one water molecule in a distorted octahedral environment. The two L dianions are situated across inversion centres and bridge neighbouring ZnII centres, yielding a chain propagating parallel to [100]. O—H⋯O hydrogen bonds between the coordinated water molecule, the solvent water molecule (half-occupied) and the carboxylate O atoms further stabilize the structure.

A novel parallel interpenetrating two-dimensional (4,4) network: poly[[μ2-1,4-bis(imidazol-1-ylmethyl)benzene](μ2-naphthalene-1,4-dicarboxylato)zinc(II)]

In the title coordination compound, [Zn(C(12)H(6)O(4))(C(14)H(14)N(4))](n), the two Zn(II) centers exhibit different coordination environments. One Zn(II) center is four-coordinated in a distorted tetrahedral environment surrounded by two carboxylate O atoms from two different naphthalene-1,4-dicarboxylate (1,4-ndc) anions and two N atoms from two distinct 1,4-bis(imidazol-1-ylmethyl)benzene (1,4-bix) ligands. The coordination of the second Zn(II) center comprises two N atoms from two different 1,4-bix ligands and three carboxylate O atoms from two different 1,4-ndc ligands in a highly distorted square-pyramidal environment. The 1,4-bix ligand and the 1,4-ndc anion link adjacent Zn(II) centers into a two-dimensional four-connected (4,4) network. The two (4,4) networks are interpenetrated in a parallel mode.

Crystal structure of bis­{μ-4,4′-[1,3-phenyl­enebis(­oxy)]dibenzoato-κ4O,O′:O′′,O′′′}bis[(1,10-phenanthroline-κ2N,N′)zinc(II)] dihydrate

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.

Crystal structure of poly[[{μ2-1,4-bis[(1H-imid-azol-1-yl)methyl]benzene}[μ6-5-(4-carboxylatophenoxy)isophthalato]-μ3-hydroxido-dicobalt(II)] 0.25-hydrate].

The title coordination polymer, {[Co2(C15H7O7)(OH)(C14H14N4)]·0.25H2O}n, was synthesized under hydrothermal conditions. The asymmetric unit contains two Co2+ ions, one L 3− anion originating from 5-(4-carboxyphenoxy)isophthalic acid (H3 L), 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 L 3− 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 μ 3-OH ligands, forming a butterfly-shaped secondary building unit (SBU). These SBUs are connected by L 3− 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.

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)] hemi-hydrate].

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.

2',6'-Bis(4-carb-oxy-phen-yl)-4,4'-bipyridin-1-ium nitrate 0.25-hydrate.

In the title compound, C24H17N2O4 +·NO3 −·0.25H2O, the central pyridine ring of the 2′,6′-bis(4-carboxyphenyl)-4,4′-bipyridin-1-ium cation is almost coplanar with one benzene ring [dihedral angle = 1.03 (5)°], while it makes dihedral angles of 9.59 (5)° with the other benzene ring and 13.66 (6)° with the pyridinium ring. In the crystal, N—H⋯O and O—H⋯O hydrogen bonds link the cations and nitrate anions into a sheet in the (302) plane. The crystal structure also exhibits π–π interactions between the central pyridine ring and the benzene rings of neighboring molecules [centroid–centroid distance = 3.6756 (13) Å].

catena-Poly[[zinc-bis­(μ-2-sulfido-1H-benzimidazol-3-ium-5-carboxyl­ato)-κ2O:S;κ2S:O] trihydrate]

In the title compound, {[Zn(C8H5N2O2S)2]·3H2O}n, the ZnII atom, lying on a twofold rotation axis, is four-coordinated by two S atoms and two O atoms from four 2-sulfido-1H-benzimidazol-3-ium-5-carboxylate (H2mbidc) ligands in a distorted tetrahedral geometry. Two H2mbidc ligands bridge two ZnII atoms, generating a double-chain along [01]. Adjacent chains are linked by N—H⋯O and O—H⋯O hydrogen bonds, forming a three-dimensional supramolecular network. One of the two water molecules also lies on a twofold rotation axis.