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catena-Poly[[lithium-μ(2)-(dihydrogen pyrazine-2,3,5,6-tetracarboxylato)-κ(6) O (2),N (1),O (6);O (3),N (4),O (5)-lithium-di-μ-aqua-κ(4) O:O] 2.5-hydrate]
The title coordination polymer, {[Li(2)(C(8)H(2)N(2)O(8))(H(2)O)(2)]·2.5H(2)O}(n), is built up from molecular ribbons propagating in the c-axis direction of the orthorhombic unit cell; the ligand bridges two Li(+) ions using both its N,O,O′-bonding sites and adjacent Li(+) ions are bridged by pai...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4050999/ https://www.ncbi.nlm.nih.gov/pubmed/24940214 http://dx.doi.org/10.1107/S160053681401174X |
Sumario: | The title coordination polymer, {[Li(2)(C(8)H(2)N(2)O(8))(H(2)O)(2)]·2.5H(2)O}(n), is built up from molecular ribbons propagating in the c-axis direction of the orthorhombic unit cell; the ligand bridges two Li(+) ions using both its N,O,O′-bonding sites and adjacent Li(+) ions are bridged by pairs of water molecules. The coordination geometry of the metal ion is distorted trigonal bipyramidal, with the ligand O atoms in the axial sites. Two of the carboxylate groups of the ligand remain protonated and form short symmetric O—H⋯O hydrogen bonds. In the crystal, the ribbons interact via a network of O—H⋯O hydrogen bonds in which coordinating water molecules act as donors and carboxylate O atoms within adjacent ribbons act as acceptors, giving rise to a three-dimensional framework. O—H⋯N interactions are also observed. The asymmetric unit contains quarter of the ligand and the complete ligand has 2/m symmetry; the Li(+) ion lies on a special position with m.. site symmetry. Both bridging water molecules have m2m site symmetry and both lattice water molecules have m.. site symmetry; one of the latter was modelled with a site occupancy of 0.25. |
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