catena-Poly[[[diaqua­(1,3-benzimidazole-κN (3))manganese(II)]-μ-benzene-1,3-di­carboxyl­ato-κ(3) O (1),O (1′):O (3)] dihydrate]

In the polymeric title complex, {[Mn(C(8)H(4)O(4))(C(7)H(6)N(2))(H(2)O)(2)]·2H(2)O}(n), the Mn(II) cation is coordinated by two benzene­dicarboxyl­ate anions, one benzimidazole ligand and two water mol­ecules in a distorted MnNO(5) octa­hedral geometry. In the crystal, each benzene­dicarboxyl­ate anion bridges adjacent Mn(II) cations through the terminal carboxyl­ate groups, forming a polymeric complex chain along the a axis. One Mn—O(carboxyl­ate) bond is much longer than the others. In the crystal, π–π stacking is observed between nearly parallel [dihedral angle = 4.32 (6)°] benzimidazole aromatic ring systems of adjacent mol­ecules, the centroid–centroid distance between the imidazole and benzene rings being 3.5421 (11) Å. Extensive inter­molecular O—H⋯O and N—H⋯O hydrogen bonding is present in the crystal structure. The two lattice water mol­ecules are located on twofold rotation axes.