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Catena-Poly[[(6-carb-oxy-pyrazine-2-carboxyl-ato)lithium]-?-aqua].

ABSTRACT: The asymmetric unit of the title compound, [Li(C(6)H(3)N(2)O(4))(H(2)O)](n), contains an Li(I) ion with a distorted trigonal-bipyramidal coordination environment. It is chelated by a singly protonated ligand mol-ecule via its heterocyclic N atom, by two O aoms, each donated by an adjacent carboxyl-ate group, and is further coordinated by a water O atom which acts as a bridge, forming a mol-ecular ribbon. A proton attached to one of the carboxyl-ate O atoms is situated on an inversion centre and forms a short centrosymmetric hydrogen bond, generating mol-ecular layers parallel to the ac plane. These layers are held together by weak O-H?O hydrogen bonds in which the coordinated water mol-ecules act as donors, whereas carboxyl-ate O atoms are acceptors.

SUBMITTER: Starosta W

PROVIDER: S-EPMC3238630 | biostudies-literature | 2011 Dec

REPOSITORIES: biostudies-literature

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catena-Poly[[(6-carb-oxy-pyrazine-2-carboxyl-ato)lithium]-μ-aqua].

Starosta Wojciech W Leciejewicz Janusz J

Acta crystallographica. Section E, Structure reports online 20111109 Pt 12

The asymmetric unit of the title compound, [Li(C(6)H(3)N(2)O(4))(H(2)O)](n), contains an Li(I) ion with a distorted trigonal-bipyramidal coordination environment. It is chelated by a singly protonated ligand mol-ecule via its heterocyclic N atom, by two O aoms, each donated by an adjacent carboxyl-ate group, and is further coordinated by a water O atom which acts as a bridge, forming a mol-ecular ribbon. A proton attached to one of the carboxyl-ate O atoms is situated on an inversion centre and ...[more]

PMID: 22199521

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catena-Poly[[aqua-lithium(I)]-μ-3-carb-oxy-5,6-di-methyl-pyrazine-2-carboxyl-ato-κ(4) O (2),N (1):O (3),N (4)].

Project description:The asymmetric unit of the title compound, [Li(C8H6N2O4)(H2O)] n , comprises three Li cations, two of which are located on a twofold rotation axis, two carboxylate anions and three water mol-ecules, of which two are situated on the twofold rotation axis being aqua ligands. Both carboxylate anions are in μ2-bridging mode. All Li ions show a trigonal-bipyramidal coordination mode; the two located in special positions are bridged through N,O-bonding sites generating a polymeric ribbon along the c-axis direction. The Li cation in a general position creates an independent polymeric ribbon through N,O-bonding sites of the two symmetry-related ligands; the trigonal-bipyramidal coordination is completed by an aqua ligand. In both carboxylate anions, a carboxyl-ate and a carb-oxy-lic acid group form an intra-molecular hydrogen bond. The polymeric ribbons running along [001] are inter-connected by hydrogen bonds in which the water mol-ecules act as donors and carboxyl-ate O atoms act as acceptors, giving rise to a three-dimensional architecture.

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catena-Poly[[(diaqua-zinc)-?-3-carb-oxy-pyrazine-2-carboxyl-ato-?N,O;N,O] nitrate].

Project description:The crystal structure of the title compound, {[Zn(C(6)H(3)N(2)O(4))(H(2)O)(2)]NO(3)}(n), is built of zigzag cationic chains propagating in [010] with nitrate anions located in the space between the chains. The Zn(II) ion is coordinated by N and O atoms of two symmetry-related ligands in equatorial sites, and by two water O atoms at the axial sites of a distorted octa-hedron. One carboxyl-ate group of the ligand remains protonated, serving as a donor in a short intra-molecular O-H?O hydrogen bond. The coordinated water mol-ecules are donors and the nitrate O atoms act as acceptors in a network of O-H?O hydrogen bonds.

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Project description:The structure of the title compound, [Li(C(5)H(3)N(2)O(2))(H(2)O)](n), contains an Li(I) ion with a distorted trigonal-bipyramidal coordination environment involving the N and O atoms of pyrazine-2-carboxyl-ate ligands with a bridging carboxyl-ate group, and two aqua O atoms also in a bridging mode. The symmetry-related Li(I) ions bridged by a carboxyl-ate O atom and a coordinating water O atom form an Li(2)O(2) unit with an Li⋯Li distance of 3.052 (4) Å, which generates mol-ecular ribbons propagating in the c-axis direction. The ribbons are held together by a network of O-H⋯O hydrogen bonds in which the coordinating water mol-ecules act as donors and the carboxyl-ate O atoms as acceptors.

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catena-Poly[[diaqua-lithium]-?-[rac-cis-(2-carb-oxy-cyclo-hexane-1-carboxyl-ato-?O:O]].

Project description:In the structure of the title compound, [Li(C(8)H(11)O(4))(H(2)O)(2)](n), the distorted tetra-hadral LiO(4) coordination sphere comprises two water mol-ecules and two carboxyl O-atom donors from separate bridging cis-2-carb-oxy-cyclo-hexane-1-carboxyl-ate monoanions [Li-O = 1.887?(4)-1.946?(3)?Å], giving chain substructures which extend along [010]. Water-water and water-carboxyl O-H?O hydrogen bonds stabilize these chain structures and provide inter-chain links, resulting in a two-dimensional layered structure extending parallel to (100).

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Poly[(?4-3-carb-oxy-pyrazine-2-carboxyl-ato)(?4-nitrato)dilithium].

Project description:In the title compound, [Li2(C6H3N2O4)2(NO3)] n , the two symmetry-independent Li(I) ions are each in a trigonal-bipyramidal coordination and are bridged by N,O-bonding ligands, forming mol-ecular ribbons propagating in [010]. Each Li(I) ion is also coordinated by two O atoms from nitrate ions, connecting the ribbons into a three-dimensional network. Very strong intra-molecular O-H?O hydrogen bonds occur between the carboxyl and the carboxylate group.

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catena-Poly[[tri-aqua-copper(II)]-?-5-carb-oxy-benzene-1,3-di-carboxyl-ato-?(2) O (1):O (3)].

Project description:In the title complex, [Cu(C9H4O6)(H2O)3] n , the Cu(II) cation exhibits a distorted square-pyramidal coordination geometry involving five O atoms from two monodentate 5-carb-oxy-benzene-1,3-di-carboxyl-ate anions and three water mol-ecules. The 5-carb-oxy-benzene-1,3-di-carboxyl-ate anions bridge Cu(II) cations into zigzag polymeric chains running along the b-axis direction. These chains are further linked by O-H?O hydrogen bonds between coordinating water mol-ecules or carboxyl groups and carboxylate groups into a three-dimensional supra-molecular architecture. In the crystal, ?-? stacking is observed between parallel benzene rings of adjacent chains, the centroid-centroid distances being 3.584?(3) and 3.684?(3)?Å.

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catena-Poly[[(5-carb-oxy-2H-1,2,3-triazole-4-carboxyl-ato-κN,O)sodium]-di-μ-aqua-κO:O].

Project description:In the title coordination polymer, [Na(C(4)H(2)N(3)O(4))(H(2)O)(2)](n), the Na(I) atom is six-coordinated by one O atom and one N atom from a 2H-1,2,3-triazole-4-carb-oxy-5-carboxyl-ate ligand and four O atoms from four water mol-ecules, forming a distorted octa-hedal geometry. The Na(I) atoms are bridged by water mol-ecules into a chain structure along [100]. Inter-molecular N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds connect the chains. An intra-molecular O-H⋯O hydrogen bond between the carboxyl-ate groups is observed.

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catena-Poly[[(3,5-dicarb-oxy-pyrazine-2,6-dicarboxyl-ato-?O,N,O)lithium(I)]-?-aqua-[triaqua-lithium(I)]-?-aqua].

Project description:The title coordination polymer, [Li(2)(C(8)H(2)N(2)O(8))(H(2)O)(5)](n) contains two symmetry-independent Li(+) ions; one is coordin-ated by five water O atoms, the other by an O,N,O'-tridentate doubly deprotonated pyrazine-2,3,5,6-tetra-carboxyl-ate ligand and two water O atoms. Water mol-ecules bridge adjacent Li(+) ions into ribbons propagating in [100]; an alternative analysis of the structure considers it to contain alternating [Li(C(8)H(2)N(2)O(8))(H(2)O)(2)](-) anions and [Li(H(2)O)(3)](+) cations. In the polymeric model, both lithium ions show distorted trigonal-bipyramidal coordination geometries. Within the ligand, the carboxyl H atoms participate in short, almost symmetric O?H?O hydrogen bonds in which the non-coordinated carboxyl-ate O atoms are donors and acceptors. In the crystal, the ribbons inter-act via a network of O-H?O hydrogen bonds in which the coordinated water mol-ecules act as donors and ligand carboxyl-ate O atoms as acceptors.

| S-EPMC3011810 | biostudies-other

catena-Poly[[tetra-aqua-μ-aqua-bis-(μ(4)-pyrimidine-2-carboxyl-ato)tetra-lithium] dichloride].

Project description:The asymmetric unit of the title compound, [Li(4)(C(5)H(3)N(2)O(2))(2)(H(2)O)(5)]Cl(2), contains two Li(I) cations, one with a distorted trigonal-bipyramidal and the other with a distorted tetra-hedral coordination geometry. Two symmetry-related asymmetric units constitute a building block of the structure, in which both ligand carboxyl-ate O atoms are bidentate and bridge the metal ions, forming a divalent cation. Charge balance is maintained by two chloride anions. The building blocks, bridged by Li(I) cations, form cationic ribbons with chloride anions in the space between them. The ribbons propagate in [010] and are held together by a network of weak O-H⋯O hydrogen bonds which operate in the space between adjacent ribbons.

| S-EPMC3515122 | biostudies-literature

catena-Poly[[[diaqua-nickel(II)]-?-pyrazine-2-carboxyl-ato-silver(I)-?-pyrazine-2-carboxyl-ato] nitrate dihydrate].

Project description:In the polymeric complex of the title compound, {[AgNi(C(5)H(3)N(2)O(2))(2)(H(2)O)(2)]NO(3)·2H(2)O}(n), the Ag(I) ion displays an angular coordination geometry with two N atoms from pyrazine-2-carboxyl-ate ligands, and the Ni(II) ion is hexa-coordinated by two O atoms from two water mol-ecules, two O and two N atoms from pyrazine-2-carboxyl-ate ligands in a distorted octa-hedral geometry. In the crystal, the Ag(I) and Ni(II) ions lie on a mirror plane and an inversion centre, respectively. The complex chains, the nitrate ions and the uncoordinated water mol-ecules are linked together through O-H?O hydrogen bonds and weak Ag?O inter-actions [2.619?(17)-2.749?(17)?Å] into a three-dimensional network.

| S-EPMC3344408 | biostudies-literature

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