Acta Cryst. (2009). E65, m1288-m1289  [ doi:10.1107/S1600536809039075 ]

Poly[(6-carboxypicolinato-³O²,N,O⁶)(₃-pyridine-2,6-dicarboxylato-⁵O²,N,O⁶:O^2':O^6')dysprosium(III)]

X. Li, Q.-Y. Lian, Q.-H. Meng, Y.-F. Luo and R.-H. Zeng

Abstract: In the title complex, [Dy(C₇H₃NO₄)(C₇H₄NO₄)]_n, one of the ligands is fully deprotonated while the second has lost only one H atom. Each Dy^III ion is coordinated by six O atoms and two N atoms from two pyridine-2,6-dicarboxylate and two 6-carboxypicolinate ligands, displaying a bicapped trigonal-prismatic geometry. The average Dy-O bond distance is 2.40 Å, some 0.1Å longer than the corresponding Ho-O distance in the isotypic holmium complex. Adjacent Dy^III ions are linked by the pyridine-2,6-dicarboxylate ligands, forming a layer in (100). These layers are further connected by - stacking interactions between neighboring pyridyl rings [centroid-centroid distance = 3.827 (3) Å] and C-HO hydrogen-bonding interactions, assembling a three-dimensional supramolecular network. Within each layer, there are other - stacking interactions between neighboring pyridyl rings [centroid-centroid distance = 3.501 (2) Å] and O-HO and C-HO hydrogen-bonding interactions, which further stabilize the structure.

Online 3 October 2009

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