Syntheses, characterizations and crystal structures of four zinc(II) and cadmium(II) complexes constructed by ligand bearing poly-coordination atoms

Article abstract of DOI:10.1016/j.ica.2010.04.037

Treatment of 3-(4-carboxyphenylhydrazono)pentane-2,4-dione (HL) with transition metal ions afforded four novel complexes, [Zn(L)(μ₂- OOCCH₃)(H₂O)]_n (1), [Zn(L)₂(MeOH) ₄] (2), {[Cd₄(η²-L) ₄(μ₂-η²-L)₄(H ₂O)₄(MeOH)₂]·MeOH) (3) and [Cd(n ²-L)(μ₂-η²-OOCCH₃)(H ₂O)₂]_n (4). Their crystal structures have been characterized by single-crystal X-ray crystallography. In polymer 1, the acetate anions bridge the Zn(II) ions forming an infinite one-dimensional (1-D) chain with L^- units acting as monodentate ligands in the side chain. In mononuclear complex 2, two L^- ligands act as monodentate fashion to coordinate to the Zn(II) ion. In its solid-state structure, [Zn(L) ₂(MeOH)₄] groups are joined together by hydrogen bonds forming a three-dimensional (3-D) supramolecular network. In tetranuclear complex 3, four Cd(II) ions are linked by four μ₂- η²-L^- ligands, and chelated by another four L ^- ligands, respectively. In polymer 4, the acetate anions bridge the Cd(II) ions leading to a 1-D chain containing chelating L^- units in the side chain.