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Poly[[(?-3-amino-pyrazine-2-carboxyl-ato-?N,O:O')diaqua-(?-oxalato-?O,O:O,O)lanthanum(III)] monohydrate].

ABSTRACT: The water-coordinated La(III) atom in the title compound, {[La(C(5)H(4)N(3)O(2))(C(2)O(4))(H(2)O)(2)]·H(2)O}(n), is N,O-chelated by a 3-amino-pyrazine-2-carboxyl-ate ion; this ion links adjacent metal atoms to form a chain parallel to [010]. The oxalate ion serves as a bis-bidentate chelate that links adjacent metal atoms to form a chain parallel to [001]. The two bridging ions give rise to a layer motif parallel to (100) in which the La(III) atom exists in a distorted tricapped trigonal prismatic geometry. Extensive hydrogen bonding between the constituents stabilizes the structure.

SUBMITTER: Gao S

PROVIDER: S-EPMC3200678 | biostudies-literature | 2011 Sep

REPOSITORIES: biostudies-literature

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Poly[[(μ-3-amino-pyrazine-2-carboxyl-ato-κN,O:O')diaqua-(μ-oxalato-κO,O:O,O)lanthanum(III)] monohydrate].

Gao Shan S Ng Seik Weng SW

Acta crystallographica. Section E, Structure reports online 20110827 Pt 9

The water-coordinated La(III) atom in the title compound, {[La(C(5)H(4)N(3)O(2))(C(2)O(4))(H(2)O)(2)]·H(2)O}(n), is N,O-chelated by a 3-amino-pyrazine-2-carboxyl-ate ion; this ion links adjacent metal atoms to form a chain parallel to [010]. The oxalate ion serves as a bis-bidentate chelate that links adjacent metal atoms to form a chain parallel to [001]. The two bridging ions give rise to a layer motif parallel to (100) in which the La(III) atom exists in a distorted tricapped trigonal prismat ...[more]

PMID: 22058888

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Poly[diaqua-μ-oxalato-μ-pyrazine-2-carbox-yl-ato-lanthanum(III)].

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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.

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Project description:In the hydro-thermally synthesized title compound, [Ce(C(5)H(3)N(2)O(2))(C(2)O(4))(H(2)O)(2)](n), the Ce(III) ion is coordinated by four O atoms from two different oxalate ligands, three O atoms from two symmetry-related pyrazine-2-carboxyl-ate ligands, two O atoms from two water melecules and one N atom from a pyrazine-2-carboxyl-ate ligand in a distorted bicapped square-anti-prismatic coordination geometry. The oxalate and pyrazine-2-carboxyl-ate ligands bridge the Ce(III) ions, forming a two-dimensional structure. In addition, inter-molecular O-H?O and O-H?N hydrogen bonds connect the two-dimensional structure into a three-dimensional network.

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