Poly[bis­(4-chloro­pyridinium) tetra-μ₂-chlorido-tetra­chloridotrimercurate(II)]

The structure of the title compound, {(C₅H₅ClN)₂[Hg₃Cl₈]}_n, consists of 4-chloro­pyridinium cations and one-dimensional [Hg₃Cl₈]²⁻ anion chains. There are two coordination environments for Hg^II in the inorganic chain. The first is a distorted tetra­hedral geometry made up of an HgCl₂ unit with two Cl⁻ anion bridges, while the second is an octa­hedral coordination geometry consisting of an HgCl₂ unit and four chloride-anion bridges. This gives rise to a novel three-layer centrosymmetric polymer. Finally, the three-dimensional network comes about through the many C—H...Cl and N—H...Cl hydrogen bonds that link the organic and inorganic layers.

A potential molecular ferroelectric material: poly[[bis­(1-aza-4-azonia­bicyclo[2.2.2]octane)di-μ₃-chlorido-tetra-μ₂-chlorido-dichlorido­tri­cadmium(II)] dihydrate]

The title compound, {[Cd₃(C₆H₁₃N₂)₂Cl₈]·2H₂O}_n, consists of pendant proton­ated cationic diamine ligands bonded to an anionic one-dimensional coordination polymer chlorido­cadmate scaffold. Each coordination chain features two kinds of Cd^II centre, each with distorted octa­hedral coordination geometry. One Cd^II cation lies on a centre of inversion and is coordinated by six bridging chloride ligands, while the other is coordinated by four bridging chloride ligands, one terminal chloride ligand and a 1-aza-4-azonia­bicyclo­[2.2.2]octane aza N atom. This gives a reversible corner-sharing half-cubic linear polymer that lies along the crystallographic a direction. The chains inter­act through hydrogen bonding with solvent water, with each water mol­ecule accepting one N—H...O inter­action from a cation and donating to two O—H...Cl inter­actions with anionic chains, thus linking three separate chains and completing the packing structure.

A one-dimensional ABX₃-type coordination polymer: catena-poly[benzyl­tri­methyl­ammonium [tri-[mu]-chlorido-cadmium(II)]]

The crystal structure of the title novel one-dimensional ABX₃-type organic-inorganic hybrid complex {(C₁₀H₁₆N)[CdCl₃]}_n, (I), consists of benzyl­tri­methyl­ammonium (Me₃BzN⁺) cations and one-dimensional anionic {[Cd([mu]-Cl)₃]^-}_[infinity] chains. Each Cd^II centre is hexacoordinated by bridging chloride ligands, giving a slightly distorted octa­hedral Cd([mu]-Cl)₆ arrangement. The octa­hedra are linked by two opposite shared faces, giving rise to an almost perfectly linear anionic {[Cd([mu]-Cl)₃]^-}_[infinity] chain in the a-axis direction. Me₃BzN⁺ cations located in the inter-chain spaces balance the charge. Noncovalent static attracting forces (Coulombic and van der Waals forces) and nonclassical C-H...Cl hydrogen-bond inter­actions stabilize the crystal structure.

Bis{tris­[(1H-benzimidazol-3-ium-2-yl)methyl]amine} tetra­aqua­octa-[mu]₂-chlorido-octa­chloridopenta­cadmate(II) monohydrate

The structure of the anion is a novel chloride-bridged penta­nuclear cluster. The five unique Cd^II centres have quite different coordination environments.

A novel penta­coordinated cadmium compound: catena-poly[benzyl­triethyl­ammonium [[chlorido­cadmate(II)]-di-μ-chlorido]]

The structure of a title novel one-dimensional ABX₃-type organic–inorganic hybrid complex consists of benzyl­tri­ethyl­ammonium cations and one-dimensional anionic {[CdCl₃]⁻}_n chains, in which the Cd^II centres are in an unusual two-layer five-coordinated arrangement.