catena-Poly[[[diaqua(1,3-benzimidazole-κN3)manganese(II)]-μ-benzene-1,3-dicarboxylato-κ3O1,O1′:O3] dihydrate]

Abstract

In the polymeric title complex, {[Mn(C8H4O4)(C7H6N2)(H2O)2]·2H2O}n, the MnII cation is coordinated by two benzenedicarboxylate anions, one benzimidazole ligand and two water molecules in a distorted MnNO5 octahedral geometry. In the crystal, each benzenedicarboxylate anion bridges adjacent MnII cations through the terminal carboxylate groups, forming a polymeric complex chain along the a axis. One Mn—Ocarboxylate 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.