Acta Cryst. (2009). E65, m1568-m1569  [ doi:10.1107/S1600536809046911 ]

catena-Poly[diammonium [diaquabis(pyridine-2,4-dicarboxylato-²N,O²)cuprate(II)] [[diaquacopper(II)]--pyridine-2,4-dicarboxylato-³N,O²:O^2'-[tetraaquacadmium(II)]--pyridine-2,4-dicarboxylato-³O²:N,O^2'] hexahydrate]

G.-H. Wang, Z.-G. Li, H.-Q. Jia, N.-H. Hu and J.-W. Xu

Abstract: The title mixed-metal complex, {(NH₄)₂[Cu(C₇H₃NO₄)₂(H₂O)₂][CdCu(C₇H₃NO₄)₂(H₂O)₆]·6H₂O}_n, contains one octahedrally coordinated Cd^II center and two octahedrally coordinated Cu^II centers, each lying on an inversion center. The two Cu^II atoms are each coordinated by two O atoms and two N atoms from two 2,4-pydc (2,4-H₂pydc = pyridine-2,4-dicarboxylic acid) ligands in the equatorial plane and two water molecules at the axial sites, thus producing two crystallographically independent [Cu(2,4-pydc)₂(H₂O)₂]^2- metalloligands. One metalloligand exists as a discrete anion and the other connects the Cd(H₂O)₄ units, forming a neutral chain. O-HO and N-HO hydrogen bonds connects the polymeric chains, complex anions, ammonium cations and uncoordinated water molecules into a three-dimensional supramolecular network.

Online 14 November 2009

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