Bis[2-(1H-benzimidazol-2-yl)benzoato]copper(II) dihydrate

In the title compound, [Cu(C(14)H(9)N(2)O(2))(2)]·2H(2)O, the Cu(II) ion lies on a centre of symmetry and is four-coordinated by two N atoms and two O atoms from two 2-(1H-benzimidazol-2-yl)benzoate ligands in a square-planar environment. The benzimidazol and benzyl rings form a dihedral angle of 42.8 (5)°. The mol­ecule contains two H-bonded carboxyl O acceptors and two H-bonded N—H donors in the benzimidazol groups, which inter­act with two symmetry-related uncoordinated water mol­ecules so that neighboring mol­ecular units are linked by (O—H)(water)⋯O(carbox­yl) hydrogen bonds with an R (2) (4)(8) graph-set motif, generating a helical chain in the a-axis direction. These chains are, in turn, inter­connected by (N—H)(benzimidazol)⋯O(water) hydrogen bonds, forming a three-dimensional supra­molecular network.