µ-2,5-Dihy-droxy-terephthalato-bis-[tri-aqua-(1,10-phenanthroline)zinc] dihy-droxy-terephthalate.

In the title compound, [Zn2(C8H4O6)(C12H8N2)2(H2O)6](C8H4O6), the complete ions of both the binuclear dication and the dianion are generated by crystallographic inversion symmetry. The Zn atom is bonded to an N,N'-bidentate phenanthroline ligand, three water moleules and an O-mono-denate 2,5-dihy-droxy-terephthalate dianion. In the resulting distorted octa-hedral ZnN2O4 coordination poly-hedron, the water O atoms are in a mer orientation. Two intra-molecular O-H⋯O hydrogen bonds occur in the bridging 2,5-dihy-droxy-terephthalate dianion within the complex cation and also in the free dianion. An intra-molecular Ow-H⋯O (w = water) hydrogen bond also occurs within the dication. In the crystal, O-H⋯O hydrogen bonds link the component ions into a three-dimensional network.

Poly[aqua[µ2-1,4-bis(imidazol-1-ylmethyl)benzene-κ2N3:N3'](µ2-5-hydroxybenzene-1,3-dicarboxylato-κ4O1,O1':O3,O3')cadmium(II)], a twofold interpenetrated CdSO4-like metal-organic polymer.

In the title cadmium(II) complex, [Cd(C(8)H(4)O(5))(C(14)H(14)N(4))(H(2)O)](n), the 5-hydroxybenzene-1,3-dicarboxylate (5-OH-1,3-bdc) and 1,4-bis(imidazol-1-ylmethyl)benzene (1,4,-bix) ligands bridge water-coordinated Cd(II) atoms to generate a three-dimensional network. Two carboxylate groups from different ligands function as O,O'-chelates, while two imidazole N atoms from different ligands coordinate in a monodentate fashion, and one water molecule completes the seven-coordinate pentagonal bipyramid around the Cd(II) atom, in which the N atoms occupy the axial sites and the O atoms occupy the equatorial sites. The overall architecture is a twofold interpenetrated CdSO(4)-type framework. The two crystallographically equivalent frameworks are linked by O-H···O hydrogen bonds between the water, hydroxy and carboxylate groups.

Hydrogen Bonds in Bis(1H-benzimidazole-κN3)cadmium(II) Dibenzoate: Hirshfeld Surface Analysis and AIM Perspective.

The coordination complex bis(1H-benzimidazole-κN3)cadmium(II) dibenzoate has been synthesized and characterized by single crystal diffraction analysis. Cadmium center is six coordinated and formed a distorted octahedron coordinated geometry. The Hirshfeld analysis shows that in the dnorm-surface of the compound, there are dark red spots near the hydrogen-bonds acceptor and donor atoms, while intermolecular interactions result in faint-red spots. The AIM analysis was performed, there exist a BCP in each N(C)-H∙∙∙O hydrogen bond, the bond paths also can be seen, the |V(b)|/G(b) < 1 and the H(b) > 0, the interaction is indicative of being a closed shell. The TG results are consistent with the X-ray diffraction structure.

Poly[[[mu-1,1'-(butane-1,4-diyl)diimidazole-kappa2N:N'](mu-cyclohexane-1,4-dicarboxylato-kappa4O1,O1':O4,O4')cadmium(II)] hemihydrate]: a parallel interpenetrating two-dimensional (4,4) network.

In the title coordination compound, {[Cd(C(8)H(10)O(4))(C(10)H(14)N(4))].0.5H(2)O}(n), the 1,1'-(butane-1,4-diyl)diimidazole ligand and the cyclohexane-1,4-dicarboxylate dianion both function in a bridging mode to link adjacent cadmium(II) centers into a two-dimensional four-connected (4,4) network. The networks are parallel to the (001) plane. Two (4,4) networks are interpenetrated in an unusual parallel mode. The compound is the first two-dimensional parallel interpenetrating (4,4) network structure based on a flexible dicarboxylate and a long bidentate N-donor ligand. The interpenetrating nets are further consolidated by water-carboxylate O-H...O hydrogen bonds.