Research Article: Poly[[dodeca­aqua­(μ4-benzene-1,4-dicarboxyl­ato)(μ2-4,4′-bipyridine-κ2N:N′)dicerium(III)] bis­(benzene-1,4-dicarboxyl­ate)]

Date Published: May 01, 2012

Publisher: International Union of Crystallography

Author(s): Hitoshi Kumagai, Yoshiyuki Sakamoto, Satoshi Kawata, Shinji Inagaki.


The asymmetric unit of the title compound, {[Ce2(C8H4O4)(C10H8N2)(H2O)12](C8H4O4)2}n, consists of half a CeIII cation, a quarter of a coordinated benzene-1,4-dicarboxyl­ate (bdc2−) dianion, a quarter of a 4,4′-bipyridine (bpy) mol­ecule, three water mol­ecules and a half of an uncoordinated benzene-1,4-dicarboxyl­ate dianion. The CeIII ion is located on a twofold rotation axis and exhibits a distorted trigonal prism square-face tricapped coordination geometry. The coordinated and uncoordinated bdc2− ions and the bpy mol­ecule lie about special positions of site symmetries 2/m, m and 2/m, respectively. The CeIII ions are bridged by the bdc2− and bpy ligands, giving a sheet structure parallel to the ac plane. The uncoordinated bdc2− dianion exists between the sheets and links the sheets by inter­molecular O—H⋯O hydrogen bonds between the uncoordinated bdc2− and coordinated water mol­ecules. A π–π stacking inter­action between the uncoordinated bdc2− dianion and the bpy ligand [centroid–centroid distance = 3.750 (4) Å] is also observed.

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For coordination polymers, see: Cheetham et al. (1999 ▶); Furukawa et al. (2010 ▶). For related host–guest systems, see: Kawata & Kitagawa (2002 ▶).