| Abstract: | In the centrosymmetric dinuclear anions of the title bimetallic complex, {[Mg(H2O)6][Cu2(C8H2NO7)2]·2H2O}n, each CuII ion is strongly coordinated by four O atoms in a distorted square‐planar geometry. Two of these O atoms belong to phenolate groups and the other two to carboxylate groups from 5‐nitro‐2‐oxidoisophthalate (L1) trianions, derived from 5‐nitrobenzene‐1,2,3‐tricarboxylic acid (O2N–H3L). The phenolate O atoms bridge the two CuII ions in the anion. In addition, each CuII cation interacts weakly with a symmetry‐related carboxylate O atom of an adjacent L1 ligand, giving a square‐pyramidal coordination geometry. The copper residue forms a ladder‐like linear coordination polymer via L1 ligands. The [Mg(H2O)6]2+ cations sit on centres of inversion. The polymeric anions, cations and free water molecules are self‐assembled into a three‐dimensional supramolecular network via O—H...O hydrogen bonds. |
