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Poly[aqua-(?(2)-oxalato)(4-oxidopyri-din-ium)erbium(II)].

ABSTRACT: The title complex, [Er(C(5)H(5)NO)(C(2)O(4))(H(2)O)](n), is a new erbium polymer based on oxalate and 4-oxidopyridinium ligands. The Er(II) center is coordinated by six O atoms from three oxalate ligands, one O atom from a 4-oxidopyridinium ligand and one water mol-ecule, and displays a distorted square-anti-prismatic coordination geometry. The oxalate ligands are both chelating and bridging, and link Er(II) ions, forming Er-oxalate layers in which the attached water and 4-oxidopyridinium units point alternately up and down. A mirror plane passes through the Er atom, one C, the oxide O and two oxalate O atoms. The layers are assembled into a three-dimensional supra-molecular network via inter-molecular hydrogen bonding and ?-? stacking inter-actions [centroid-centroid distances of 3.587?(2)?Å between parallel pyridinium rings]. Both the water mol-ecule and the 4-oxidopyridinium ligand are disordered over two sites in a 1:1 ratio.

SUBMITTER: Gu CS

PROVIDER: S-EPMC2961229 | biostudies-literature | 2008 Apr

REPOSITORIES: biostudies-literature

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Poly[aqua-(μ(2)-oxalato)(4-oxidopyri-din-ium)erbium(II)].

Gu Chang-Sheng CS Hao Xiao-Min XM Song Wen-Dong WD Lin Hai-Sheng HS Ma De-Yun DY

Acta crystallographica. Section E, Structure reports online 20080410 Pt 5

The title complex, [Er(C(5)H(5)NO)(C(2)O(4))(H(2)O)](n), is a new erbium polymer based on oxalate and 4-oxidopyridinium ligands. The Er(II) center is coordinated by six O atoms from three oxalate ligands, one O atom from a 4-oxidopyridinium ligand and one water mol-ecule, and displays a distorted square-anti-prismatic coordination geometry. The oxalate ligands are both chelating and bridging, and link Er(II) ions, forming Er-oxalate layers in which the attached water and 4-oxidopyridinium units ...[more]

PMID: 21202197

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catena-Poly[[[tetra-aqua-erbium(III)]-?-oxalato-?O,O:O,O] [bromidobis(pyrazine-2-carboxyl-ato-?N,O)cuprate(II)] tetra-hydrate].

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Project description:A monoclinic polymorph of the title compound, {[BaCu(C(2)O(4))(2)(H(2)O)(5)]·H(2)O}(n), is reported. The structure is best described as a coordination polymer where the Cu(II) and Ba(II) centers are coordinated by five and nine O atoms, respectively, in capped quadratic antiprismatic and tetragonal pyramidal geometries. The polymerization arises due to the presence of bridging mono- and bidentate oxalate ligands as well as bridging water mol-ecules. The crystal structure is consolidated by a three-dimensional network of hydrogen bonding.

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Project description:The title compound, {[Nd(2)(C(2)O(4))(3)(H(2)O)(4)]·2H(2)O}(n), was synthesized hydro-thermally in the presence of bis-(carb-oxy-ethyl-germanium) sesquioxide. It is isostructural with the corresponding Pr compound [Yang et al. (2009). Acta Cryst. E65, m1152-m1153]. The Nd(3+) cation is nine-coordinated and its coordination polyhedron can be described as a distorted tricapped trigonal prism. Two Nd(3+) ions are connected by two O atoms from two oxalate ions to give a dinuclear Nd(2) unit. The unit is further linked to four others via four oxalate ions yielding a layerparallel to (0-11). The linkages between the layers by neighbouring oxalate anions lead to a three-dimensional framework with channels along the c axis. The coordinating and free water mol-ecules are located in the channels and make contact with each other and the host framework by weak O-H?O hydrogen bonds.

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Project description:The title complex, [Dy(C(8)H(6)NO(4))(C(2)O(4))(H(2)O)](n), is a dysprosium coordination polymer with mixed anions and was obtained under hydrothermal conditions. In the structure, the oxalate and 5-amino-isophthalate ligands link the dysprosium ions, building up a two-dimensional metal-organic framework parallel to the (10) plane. These sheets are further connected through O-H?O, N-H?O and C-H?O hydrogen bonds, forming a three-dimensional supra-molecular structure.

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Project description:In the title polymeric complex, [Cd(C(5)H(3)N(6))(C(2)O(4))(0.5)(H(2)O)](n), the Cd(II) ion is coordinated by four O atoms and three N atoms from two 5-(pyrazin-2-yl)tetra-zolate ligands, two oxalate ligands and one water mol-ecule, displaying a distorted monocapped octa-hedral geometry. The bridging ligands link metal centres, forming a three-dimensional network which is stabilized by inter-molecular O-H?N hydrogen-bonding inter-actions.

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Hexa-aqua-nickel(II) bis-[tri-aqua-?3-oxalato-di-?-oxalato-bariumchromate(III)] tetra-hydrate.

Project description:The title compound, [Ni(H2O)6][BaCr(C2O4)3(H2O)3]2·4H2O, was obtained in the form of single crystals from the slow evaporation of an aqueous mixture of {Ba6(H2O)17[Cr(C2O4)3]4}·7H2O and NiSO4·6H2O in the molar ratio 1:4. Its structure is made up of corrugated anionic (101) layers of formula [BaCr(C2O4)3(H2O)3] n n - that leave voids accommodating the charge-compensating cations, [Ni(H2O)6]2+ (point group symmetry ), as well as the water mol-ecules of crystallization. The anionic layers are built from the connection of barium and chromium atoms through bridging oxalate ligands. The CrIII atom is hexa-coordinated by O atoms of three oxalate ligands while the BaII atom is tenfold coordinated by three O atoms of water mol-ecules and seven O atoms of four oxalate ligands. Each NiII atom sits on an inversion center and is coordinated by six water mol-ecules. One of the uncoordinated water mol-ecules is disordered over two sites, with a refined occupancy ratio of 0.51?(5):0.49?(5). In the crystal, extensive O-H?O hydrogen-bonding inter-actions link the anionic layers, the charge-balancing cations as well as the water mol-ecules of crystallization into a three-dimensional supra-molecular network.

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Poly[diimidazole-?(4)-oxalato-?(2)-oxalato-dicopper(II)].

Project description:The title compound, [Cu(2)(C(2)O(4))(2)(C(3)H(4)N(2))(2)](n), was obtained as an unexpected product under hydro-thermal conditions. The Cu(II) atom is in a Jahn-Teller-distorted octa-hedral environment formed by one imidazole N atom and five O atoms from three oxalate anions. The two independent oxalate anions are situated on centres of inversion and coordinate to the Cu(II) atom in two different modes, viz. bidentate and monodentate. The bidentate anions bridge two Cu(II) atoms, whereas the monodentate anions bridge four Cu(II) atoms, leading to a layered arrangement parallel to (100). These layers are further linked into a final three-dimensional network structure via inter-molecular N-H?O hydrogen bonds. The title compound is isotypic with the Zn analogue.

| S-EPMC3120292 | biostudies-literature

Poly[aqua(?(3)-5-aza-niumylisophthalato)-(?-oxalato)neodymium(III)].

Project description:The title compound, [Nd(C(8)H(6)NO(4))(C(2)O(4))(H(2)O)](n), is a layer-like coordination polymer. The Nd(III) ion is coordinated by four carboxyl-ate O atoms from three bridging 5-aza-nium-yl-isophthalate (Haip) ligands, four carboxyl-ate O atoms from two oxalate (ox) anions and one ligated water mol-ecule in a tricapped trigonal-prismatic geometry. The Haip anion acts as a ?(3)-bridge, connecting three Nd(III) ions through two carboxyl-ate groups; the ox anion adopts a bis-bidentate-bridging mode, linking two Nd(III) ions. The layer framework is further extended to a three-dimensional supra-molecular structure through N-H?O and O-H?O hydrogen bonds.

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Poly[[hemi-?(4)-oxalato-hemi-?(2)-oxalato-bis-(?(3)-pyrazine-2-carboxyl-ato)erbium(III)silver(I)] monohydrate].

Project description:The asymmetric unit of the title complex, {[AgEr(C(5)H(3)N(2)O(2))(2)(C(2)O(4))]·H(2)O}(n), contains one Er(III) atom, one Ag(I) atom, two pyrazine-2-carboxyl-ate (pyc) ligands, two half oxalate ligands (each lying on an inversion center) and one uncoordinated water mol-ecule. The Er(III) atom is coordinated by two O atoms and two N atoms from two pyc ligands, one O atom from a third pyc ligand and four O atoms from two oxalate ligands in a distorted monocapped square-anti-prismatic geometry. The Ag(I) atom is coordinated by two N atoms from two pyc ligands, one O atom from a third pyc ligand and one O atom from one oxalate ligand. The crystal structure exhibits a three-dimensional heterometallic polymeric network. O-H?O hydrogen bonding between the uncoordinated water mol-ecule and carboxyl-ate O atoms is observed.

| S-EPMC2977120 | biostudies-literature

catena-Poly[[(1,10-phenanthroline)copper(II)]-?-oxalato].

Project description:In the title coordination polymer, [Cu(C(2)O(4))(C(12)H(8)N(2))](n), the Cu(II) atom is six-coordinated by four O atoms from two oxalate ligands and two N atoms from one 1,10-phenanthroline (phen) ligand in a distorted octa-hedral coordination geometry. The oxalate anions act as bis-bidentate ligands, bridging the Cu-phen units in zigzag chains extending parallel to [100]. Inter-chain C-H?O hydrogen bonding and ?-? stacking inter-actions [centroid-centroid distance = 3.7439?(17)?Å] assemble neighboring chains, forming a three-dimensional supra-molecular network.

| S-EPMC2983185 | biostudies-literature

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