Poly[diaqua­(μ(4)-2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ato-κ(4) O (1):O (2):O (4):O (5))(μ(2)-2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ato-κ(2) O (1):O (4))bis­(1,10-phenanthroline-κ(2) N,N′)dimanganese(II)]

In the title compound, [Mn(2)(C(10)H(4)O(8))(2)(C(12)H(8)N(2))(2)(H(2)O)(2)](n), the Mn(2+) ion has a slightly distorted octa­hedral N(2)O(4) 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 (H(2)btec(2−)) ligands. The H(2)btec(2−) anion exhibits two different coordination modes, viz. μ(2) and μ(4). Both of the H(2)btec(2−) anions are located on special positions (inversion centers). The μ(4)-anion bridges adjacent Mn(II) atoms, forming a chain along the a axis. Adjacent chains are further bridged by μ(2)-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.