Poly[diaqua­(μ₄-2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ato-κ⁴O¹:O²:O⁴:O⁵)(μ₂-2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ato-κ²O¹:O⁴)bis­(1,10-phenanthroline-κ²N,N′)dimanganese(II)]

In the title compound, [Mn₂(C₁₀H₄O₈)₂(C₁₂H₈N₂)₂(H₂O)₂]_n, the Mn²⁺ ion has a slightly distorted octa­hedral N₂O₄ coordination geometry being coordinated by one aqua O atom, two N atoms of the chelating 1,10-phenanthroline ligand and three carboxyl O atoms from three 2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ate (H₂btec²⁻) ligands. The H₂btec²⁻ anion exhibits two different coordination modes, viz. μ₂ and μ₄. Both of the H₂btec²⁻ anions are located on special positions (inversion centers). The μ₄-anion bridges adjacent Mn^II atoms, forming a chain along the a axis. Adjacent chains are further bridged by μ₂-anions, resulting in a two-dimensional layered polymer parallel to (011). In the crystal, extensive carb­oxy–carboxyl­ate O—H...O and water–carboxyl­ate O—H...O inter­actions lead to the formation of a three-dimensional supra­molecular network.