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Acta Cryst. (2008). E64, m1595-m1596 [ doi:10.1107/S1600536808038476 ]

catena-Poly[{di--isonicotinato-bis[diaquaisonicotinatoeuropium(III)]}--isonicotinato-[diisonicotinatocopper(II)]--isonicotinato]

M.-L. Huang

Abstract: The title compound, [CuEu₂(C₆H₄NO₂)₈(H₂O)₄]_n, displays a one-dimensional chain structure. The four-coordinate Cu^II ion (site symmetry ${\\overline 1}$ ) adopts a trans-CuN₂O₂ geometry and is bridged by two carboxylate groups from two isonicotinate ligands. The Eu^III ion adopts a distorted square-antiprismatic geometry, being coordinated by four O atoms from bridging carboxylate groups of four isonicotinate ligands, two O atoms from chelating carboxylate groups of one isonicotinate ligand and two O atoms from coordinated water molecules; adjacent Eu^III ions in the chain are related by inversion. The water molecules interact with the ligands via O-HN hydrogen bonds [OO = 2.782 (3)-2.881 (3) Å], which link the chains into a three-dimensional structure.

Online 22 November 2008