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Poly[diaqua-di-μ(4)-citrato-trizinc(II)].

ABSTRACT: The title compound, [Zn(3)(C(6)H(5)O(7))(2)(H(2)O)(2)](n), is a polymer in which the repeating unit contains three zinc atoms, two hepta-dentate Hcit ligands (Hcit = citric acid trianion) and two coordinated water mol-ecules, only half of which are independent due to one of the metal atoms lying on a centre of symmetry. The two independent cations both exhibit an octa-hedral geometry, but the way in which they are coordinate are different; while the Zn atom in a general position is bound to three Hcit ligands and one water mol-ecule, the one at the centre of symmetry is coordinated by six O atoms from two symmetry-related Hcit ligands through the (protonated) hydroxyl and carboxyl-ate groups. The three carboxyl-ate groups coordinate to the Zn centres in three different ways, viz. chelating, bridging and a mixture of both, in an unusual coordination mode for citrate. The result is a two-dimensional structure parallel to (010), built up by a square-grid motif. Intermolecular O-H⋯O hydrogen bonds are present in the crystal structure.

SUBMITTER: Wu J

PROVIDER: S-EPMC2960923 | biostudies-literature |

REPOSITORIES: biostudies-literature

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A second modification of poly[diaquadi-?-citrato(3-)-trizinc(II)].

Project description:A second modification of the zinc(II) coordination polymer with citric acid, [Zn(3)(C(6)H(5)O(7))(2)(H(2)O)(2)](n) or [Zn(citrate)(2)(H(2)O)(2)], has been synthesized under hydro-thermal conditions by reacting zinc acetate with citric acid. The structure contains two unique Zn atoms, one with a distorted octa-hedral coordination and located on an inversion centre, and one with a distorted tetra-hedral coordination. The ZnO(6) and ZnO(4) units are linked into layers extending parallel to (010).

| S-EPMC2968354 | biostudies-literature

Poly[diaqua-μ(4)-oxalato-di-μ(6)-phosphato-tetra-cobalt(II)].

Project description:In the structure of the title compound, [Co(4)(C(2)O(4))(PO(4))(2)(H(2)O)(2)](n), there are layers composed of the phosphate anions and two independent Co(II) cations. These layers are parallel to (001) and are bridged by the oxalate anions that are situated in special positions on centres of symmetry. One independent Co atom has an octa-hedral coordination, while the second independent Co atom is coordinated in a trigonal-bipyramidal coordination that includes the water mol-ecule. The crystal packing is stabilized by O-H⋯O hydrogen bonds between the coordinated water mol-ecules and oxalate O atoms.

| S-EPMC2960387 | biostudies-literature

Poly[diaqua-μ(2)-oxalato-di-μ(2)-pyrimidine-2-carboxyl-ato-dimanganese(II)].

Project description:In the title compound, [Mn(2)(C(2)O(4))(C(5)H(3)N(2)O(2))(2)(H(2)O)(2)](n), the Mn(II) atom exhibits a distorted octa-hedral coordination geometry, with the centrosymmetric oxalate anion and the monoanionic pyrimidine-2-carboxyl-ate ligands generating a two-dimensional honeycomb network with a (6,3)-topology.

| S-EPMC2961100 | biostudies-literature

Poly[di-?(9)-citrato-cobalt(II)tetra-sodium].

Project description:The title compound, [CoNa(4)(C(6)H(5)O(7))(2)](n), was obtained under hydro-thermal conditions as a minor product. The Co(2+) cation is located on a crystallographic inversion center and is coordinated by six O atoms from two different citrate units, forming a [Co(C(6)H(5)O(7))(2)](4-) building unit with Co-O bond lengths between 2.0578?(17) and 2.0813?(16)?Å. The structure features two crystallographically independent Na(+) ions. The first Na(+) cation is five-coordinated by O atoms of five carboxylate groups from four different citrate anions. The second Na(+) cation is surrounded by six O atoms of five carboxylate groups from five different citrate anions. The carboxylate groups of the citrate are completely depronona-ted, the hydroxyl group, however, is not. It is coordinated to the Co(2+) cation, and through an O-H?O hydrogen bond connected to a neighboring [Co(C(6)H(5)O(7))(2)](4-) building unit. The coordination modes of the carboxyl-ate O atoms vary, with one O atom being coordinated to three different Na(+) cations, three are bridging O atoms bound to two Na(+) cations and two are connected to a Co(2+) cation and a Na(+) cation, respectively. Through these inter-connections, the basic [Co(C(6)H(5)O(7))(2)](4-) building units are linked with each other through coordination of their carboxyl-ate groups to the Na(+) cations, forming a three-dimensional framework.

| S-EPMC3344400 | biostudies-literature

Poly[[diaqua-?(3)-citrato-praseodymium(III)] monohydrate].

Project description:In the coordination polymer, {[Pr(C(6)H(5)O(7))(H(2)O)(2)]·H(2)O}(n), seven of the nine coordination sites of the monocapped square-anti-prismatic geometry are occupied by three O atoms of the same citrate trianion (an O atom of the hy-droxy unit and the formally single-bond O atoms from two carboxyl units). Two other coordination sites are occupied by the O atoms of a chelating carboxyl unit of another citrate; one of these atoms is additionally involved in bridging. The seventh coordination site is occupied by the O atom of the formally double-bond O atom of a neighboring citrate. The remaining two coordination sites are occupied by water mol-ecules. The citrate functions in a ?(3)-bridging mode, connecting the metal atoms into a ribbon structure parallel to [010]. The structure is consolidated into a three-dimensional network by O-H?O hydrogen bonds.

| S-EPMC3152053 | biostudies-literature

Poly[diaqua-μ(2)-oxalato-di-μ(4)-terephthalato-diytterbium(III)].

Project description:The crystal structure of the title complex, [Yb(2)(C(8)H(4)O(4))(2)(C(2)O(4))(H(2)O)(2)](n), features an extended three-dimensional framework made up of Yb(3+) ions coordinated by terephthalate ligands, oxalate ligands and water mol-ecules. The Yb(3+) ion has a distorted square-anti-prismatic coordination formed by one aqua ligand, two O atoms from an oxalate ligand and five O atoms belonging to four terephthalate anions. Two symmetry-independent terephthalate anions, as well as the oxalate anion, occupy special positions on inversion centers. The water molecule participates in O-H⋯O hydrogen bonding with both terephthalate anions.

| S-EPMC3008045 | biostudies-literature

Poly[diaqua-μ(2)-oxalato-di-μ(4)-succinato-diyttrium(III)].

Project description:In the title compound, [Y(2)(C(4)H(4)O(4))(2)(C(2)O(4))(H(2)O)(2)](n), the flexible succinate anion assumes a gauche conformation and bridges the eight-coordinated Y atoms, generating two-dimensional layers parallel to (010). The coordination polymer layers are linked into a three-dimensional framework by the rigid oxalate ligands. The oxalate ions are located on a center of inversion. Inter-molecular O-H⋯O hydrogen bonds help to stabilize the crystal structure.

| S-EPMC2969986 | biostudies-literature

Poly[diaqua-(μ(3)-succinato)cadmium(II)].

Project description:The title compound, [Cd(C(4)H(4)O(4))(H(2)O)(2)](n), has been synthesized under hydro-thermal conditions. The asymmetric unit consists of one Cd(2+) cation, one succinate anion and two aqua ligands. The Cd atoms present a distorted penta-gonal bipyramidal coordination and are bridged into layers parallel to (201) by succinate ligands.

| S-EPMC2977616 | biostudies-literature

Poly[[diaqua-deca-μ-cyanido-hexa-cyanidobis-(4-cyano-pyridine)di-μ-pyrimidine-tricopper(II)ditungsten(V)] dihydrate].

Project description:In the polymeric title compound, {[Cu(3)W(2)(CN)(16)(C(4)H(4)N(2))(2)(C(6)H(4)N(2))(2)(H(2)O)(2)]·2H(2)O}(n), the coordination geometry of W is an eight-coordinated bicapped trigonal prism. Five of the CN groups of [W(CN)(8)] are bridged to Cu ions. The coordination geometries of the Cu atoms are each pseudo-octa-hedral; one Cu atom is located on a centre of inversion. The cyano-bridged W-Cu layers are linked by Cu-containing pillars, to form a three-dimensional network with cavities occupied by noncoordinated water and 4-cyano-pyridine mol-ecules.

| S-EPMC2959564 | biostudies-literature

Poly[di-?9-citrato-tetra-sodiumzinc].

Project description:In the title compound, [Na4Zn(C6H5O7)2] n , the Zn(II) ion lies on an inversion center and is coordinated by six O atoms from two citrate ligands, forming a distorted octa-hedral geometry. There are two crystallographically independent Na(+) cations in the asymmetric unit. One Na(+) cation exhibits a distorted square-pyramidal geometry defined by five O atoms from four citrate ligands. The other Na(+) cation is surrounded by six O atoms from five citrate ligands in a distorted octa-hedral geometry. The Na(+) cations are bridged by citrate carboxyl-ate groups, forming a layer parallel to (100). The layers are further assembled into a three-dimensional network with the [Zn(citrate)2](4-) building units as 'pillars'; O-H?O hydrogen bonds also stabilize the structure.

| S-EPMC3885003 | biostudies-literature

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