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In the title compound, [Cd4Cl8(C6H16N2)4], the Cd2+ cations and Cl− anions form M 4Cl8 clusters with six of the Cl− ions bridging Cd2+ cations and two being pendant. Each Cd2+ cation has distorted octahedral coordination completed by four Cl− ions and two N atoms of the asymmetrical bidentate amino ligand. The cluster consists of pairs of face-sharing hexahedra linked by a shared edge.

A novel metal complexes Cu (II), Co (II), Cd (II), Ru (III) from azo ligand 5-((2-(1H-indol-2-yl) ethyl) diazinyl)-2-aminophenol were synthesized by simple substitution of tryptamine with 2-aminophenol. Structures of all the newly synthesized compounds were characterized by FT IR, UV-Vis, Mass spectroscopyand elemental analysis. In addition measurements of magnetic moments, molar conductance and atomic absorption. Then study their thermal stability by using TGA and DSC curves. The DCS curve was used to calculate the thermodynamic parameters ΔH, ΔS and Δ G. Analytical information showed that all complexes achieve a metal:ligand ratio of [1:1]. In all complex examinations, the Ligand performs as a tridentate ligand, connecting Cu (II), Co (II), Cd (II), and Ru (III) ions through the nitrogen atom of amine , azo groups and the oxygen phenolic group. Cu (II), Co (II), and Cd (II) complexes were characterized as having tetrahedral geometry, while Ru (III) complex was found to have octahedral geometry. The antioxidant activity of the metal complexes was assessed against the DPPH radical (1.1-diphenyl-2-picrylhydrazyl) and compared to that of a common natural antioxidant Gallic acid to observe the produced compounds. The results demonstrated ligands have more antioxidant activity than metal complexes.

The title solvated bimetallic complex, [Cd2Cl4(C13H17N3)2]·C2H5OH, comprises two Cd2+ metal ions linked by a pair of μ2 Cl− ions. The coordination sphere around each Cd2+ ion is completed by three N atoms of a tridentate 8-[2-(dimethylamino)ethylamino]quinoline ligand and another chloride ion to form a distorted fac-CdN3Cl3 octahedron. The ethanol molecule is both an acceptor of an N—H...O and a donor of an O—H...Cl hydrogen bonds to its adjacent complex unit. In the crystal, weak aromatic π–π stacking is observed.