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Tetra­kis(μ-5-bromo­nicotinato)-κ3 O,O′:O′;κ3 O:O,O′;κ4 O:O′-bis­[diaqua­(5-bromo­nicotinato-κ2 O,O′)neodymium(III)] dihydrate

By Jing Huang, Jin Zhang and Hong-Ji Chen


In the title compound, [Nd2(C6H3BrNO2)6(H2O)4]·2H2O, the NdIII ion is coordinated by nine O atoms from one chelating 5-bromo­nicotinate ligand, four bridging 5-bromo­nicotinate ligands and two water mol­ecules, exhibiting a distorted three-capped triangular-prismatic geometry. Two NdIII ions are bridged by four carboxyl­ate groups in bi- and tridentate modes, forming a centrosymmetric dinuclear unit, with an Nd⋯Nd distance of 4.0021 (5) Å, and intra­molecular π–π inter­actions between the pyridine rings [centroid–centroid distance = 3.960 (2) Å]. Inter­molecular π–π inter­actions [centroid–centroid distances = 3.820 (2) and 3.804 (2) Å] and O—H⋯N and O—H⋯O hydrogen bonds connect the dinuclear mol­ecules into a three-dimensional supra­molecular network

Topics: Metal-Organic Papers
Publisher: International Union of Crystallography
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Provided by: PubMed Central

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  3. (2010). the nine-coordinated NdIII ion in the title compound exhibits higher coordination number than that in the dimers [Gd(5-Brnic)3(H2O)2]2 (Rupam