(IUCr) Crystallography Journals Online

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

Poly[[diaquabis(-oxalato-⁴O¹,O²:O^1',O^2')bis(₃-5-oxidopyridin-1-ium-3-carboxylato-³O³:O^3':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 Ho^III 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 Ho^III atoms are bridged by the carboxylate and phenolate O atoms, forming a three-dimensional framework. N-HO and O-HO hydrogen bonds, as well as [pi] - [pi] interactions between the pyridine rings [centroid-centroid distance = 3.794 (2) Å], are observed.

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

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

Poly[[diaquabis(-oxalato-⁴O¹,O²:O^1',O^2')bis(₃-5-oxidopyridin-1-ium-3-carboxylato-³O³:O^3':O⁵)diholmium(III)] dihydrate]