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Acta Cryst. (2014). E70, m162-m163
[ doi:10.1107/S1600536814006060 ]

Bis[2,6-bis­(1H-pyrazol-1-yl)pyridine]­deca­kis­([mu]2-3-nitro­benzoato)bis­(3-nitro­benzoato)tetra­dysprosium(III): a linear tetra­nuclear dysprosium compound based on mixed N- and O-donor ligands

R. Hua, X.-L. Wu and J.-Y. Li

Abstract: The title compound, [Dy4(C7H4NO4)12(C11H9N5)2] or Dy4(L1)12(L2)2, where HL1 = 3-nitro­benzoic acid and HL2 = 2,6-bis­(1H-pyrazol-1-y1)pyridine, is a linear tetra­nuclear complex possessing inversion symmetry. The two central inversion-related DyIII atoms are seven-coordinate, DyO7, with a monocapped triangular-prismatic geometry. The outer two DyIII atoms are eight-coordinate, DyO5N3, with a bicapped triangular-prismatic geometry. The outer adjacent DyIII atoms are bridged by three L1- carboxyl­ate groups, while the inner inversion-related DyIII atoms are bridged by four L1- carboxyl­ate groups. The L2 ligands are terminally coordinated to the outer DyIII atoms in a tridentate manner. In the crystal, mol­ecules are linked via C-H...O hydrogen bonds, forming a two-dimensional network parallel to (001). Two carboxyl­ate O atoms, and N and O atoms of three nitro groups, are disordered over two positions, with a refined occupancy ratio of 0.552 (6):0.448 (6).

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