Bis(1H-benzimidazole-κN)bis-(4-methyl-benzoato-κO,O')copper(II).

In the title mononuclear complex, [Cu(C(8)H(7)O(2))(2)(C(7)H(6)N(2))(2)], the Cu(II) atom lies on an inversion centre and is coordinated by two O atoms of two monodentate 4-methyl-benzoate ligands and two N atoms of two benzimidazole ligands in a square-planar geometry. The mol-ecules are linked into chains running parallel to the b axis by inter-molecular N-H⋯O hydrogen bonds and by π-π stacking inter-actions [centroid-centroid distance = 3.669 (2) Å] involving centrosymmetrically related imidazole rings.

Aqua-bis(1H-imidazole-κN)bis-(4-methyl-benzoato-κO,O')cadmium(II).

In the title compound, [Cd(C(8)H(7)O(2))(2)(C(3)H(4)N(2))(2)(H(2)O)], the Cd(II) atom is coordinated by four carboxyl-ate O atoms from two bidentate chelating 4-methyl-benzoate ligands, two N atoms from two imidazole ligands and one water mol-ecule in a distorted penta-gonal bipyramidal geometry. Inter-molecular O-H⋯O hydrogen bonds between the coordinated water mol-ecule and the carboxyl-ate O atoms of 4-methyl-benzoate lead to an infinite chain. These chains are further self-assembled into a two-dimensional layer through N-H⋯O hydrogen bonds between the imidazole ligands and carboxyl-ate groups.

Poly[[diaqua-bis[μ-(2,4-dichloro-phen-oxy)acetato]calcium(II)] monohydrate].

In the title coordination polymer, {[Ca(C(8)H(5)Cl(2)O(3))(2)(H(2)O)(2)]·H(2)O}(n), the Ca(II) atom is eight-coordinated by six O atoms from four different (2,4-dichloro-phen-oxy)acetate ligands and two water mol-ecules, and displays a distorted square-anti-prismatic coordination geometry. The compound forms an infinite zigzag chain through connection of the metal centers by (2,4-dichlorphen-oxy)acetate ligands and hydrogen bonding of coordinated and inter-stitial water mol-ecules. These chains are further hydrogen bonded with neighboring chains, forming a supra-molecular network.

Diaqua-bis(4-methyl-benzoato-κO,O')cadmium(II).

In the title mononuclear complex, [Cd(C(8)H(7)O(2))(2)(H(2)O)(2)], the Cd(II) atom possesses crystallographically imposed C(2) site symmetry, and is coordinated by four O atoms from two 4-methyl-benzoate ligands and two water mol-ecules, displaying a distorted octa-hedral geometry. The molecules are assembled via inter-molecular O-H⋯O hydrogen-bond inter-actions into a supra-molecular architecture.