Received 7 April 2009
A new lanthanum(III)-copper(I) heterometallic coordination polymer, [Cu7La3Br6(C6H4NO2)8(C8H4O4)(H2O)4]n, has been prepared by a hydrothermal method. Of the three La atoms in the asymmetric unit, two are eight-coordinate with bicapped trigonal-prismatic configurations; the third is nine-coordinated and has a tricapped trigonal-prismatic coordination geometry. Of the seven Cu atoms, two are two-coordinate with CuBrN and CuN2 ligand sets, three have trigonal configurations, viz. CuBrN2, CuBr2N and CuBr3, while the remaining two adopt distorted tetrahedral CuBr3N geometries. In the crystal structure, adjacent La centers are linked by isonicotinate (IN-) and benzene-1,2-dicarboxylate ligands to form a two-dimensional La-carboxylate layer in the ab plane. These layers are further interconnected with each other by bridging [Cu(IN)2] motifs, leading to an unusual three-dimensional heterometallic Cu-halide-lanthanide-organic framework, with the inorganic [Cu6Br6]n chains located in the resulting channels. Two Cu atoms are disordered over two positions, both with site occupancy factors of 0.80 and 0.20. O-HO hydrogen bonding between water molecules and carboxylate O atoms helps to consolidate the crystal packing.
For background on the structures and applications of heterometallic lanthanide-transition metal (Ln-TM) coordination polymers, see: Benelli & Gatteschi (2002); Shibasaki & Yoshikawa (2002); Zhao, Cheng et al. (2004); Zhao, Chen et al. (2004); Guillou et al. (2006); Wang et al. (2006). For some examples of extended heterometallic Ln-TM architectures, see: Ren et al. (2003); Prasad et al. (2007); Cheng et al. (2008); Deng et al. (2008); Wang, Li et al. (2008). For the coordination modes of isonicotinate and benzene-1,2-dicarboxylate ligands, see: Gu & Xue (2007); Wang, Duan et al. (2008).
Data collection: APEX2 (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ2614 ).
This work was supported by the Qingdao University Research Fund (grant No. 063-06300522).
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