Bis[2,6-bis­(1H-pyrazol-1-yl)pyridine]­deca­kis­(μ₂-3-nitro­benzoato)bis­(3-nitro­benzoato)tetra­dysprosium(III): a linear tetra­nuclear dysprosium compound based on mixed N- and O-donor ligands

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 Dy^III atoms are seven-coordinate, DyO₇, with a monocapped triangular-prismatic geometry. The outer two Dy^III atoms are eight-coordinate, DyO₅N₃, with a bicapped triangular-prismatic geometry. The outer adjacent Dy^III atoms are bridged by three L1⁻ carboxyl­ate groups, while the inner inversion-related Dy^III atoms are bridged by four L1⁻ carboxyl­ate groups. The L2 ligands are terminally coordinated to the outer Dy^III 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).