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Acta Cryst. (2012). E68, m1146-m1147
[ doi:10.1107/S1600536812032916 ]

Poly[[diaquabis([mu]-oxalato-[kappa]4O1,O2:O1',O2')bis([mu]3-5-oxidopyridin-1-ium-3-carboxylato-[kappa]3O3:O3':O5)diholmium(III)] dihydrate]

J.-L. Mi, J. Huang and H.-J. Chen

Abstract: In the title compound, {[Ho2(C6H4NO3)2(C2O4)2(H2O)2]·2H2O}n, the HoIII atom is coordinated by three O atoms from three 5-hydroxynicotinate ligands, four O atoms from two oxalate ligands, each lying on an inversion center, and one water molecule in a distorted square-antiprismatic geometry. The 5-hydroxynicotinate ligand is protonated at the N atom and deprotonated at the hydroxy group. The HoIII atoms are bridged by the carboxylate and phenolate O atoms, forming a three-dimensional framework. N-H...O and O-H...O hydrogen bonds, as well as [pi]-[pi] interactions between the pyridine rings [centroid-centroid distance = 3.794 (2) Å], are observed.

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