Zinc and manganese coordination polymers constructed by a new coordination mode of 4, 5-dicyanoimidazolate ligand: Syntheses, crystal structures, fluorescent and magnetic properties

Two isostructural coordination polymers, [Zn(dci)2(H2O)2]n (1) and [Mn(dci)2(H2O)2]n (2) (Hdci = 4, 5-dicyanoimidazole), have been synthesized by conventional solution reactions and characterized by IR spectra, elemental analyses and single-crystal X-ray diffractions. In both complexes, the metal ion (ZnII for 1 and MnII for 2) is surrounded by four dciˉ ligands and two coordinated aqua in a distorted N4O2 octahedral geometry. The dciˉ anion adopts a new coordination mode of μ2-(N, Nʺ) through its neighbouring imidazole nitrogen and cyano nitrogen atoms, and connects adjacent metal ions together, thus forming the 1D double-stranded chain structures 1 and 2. The solid-state fluorescence measurements for 1 and magnetic properties for 2 have been discussed.

Two isomorphous coordination polymers [Zn(dci)2(H2O)2]n (1) and [Mn(dci)2(H2O)2]n (2) have been synthesized and characterized. The X-ray single-crystal analyses show that they are 1D double-stranded chain structures formed by a new coordination mode of dciˉ ligand. The fluorescent properties for 1 and magnetic measurements for 2 are studied.Figure optionsDownload as PowerPoint slideHighlights
► Two isostructural complexes 1 and 2 based on 4, 5-dicyanoimidazole are described.
► They both shows 1D double-stranded chain structures along the c-axis.
► The dciˉ ligand adopts a new coordination mode of μ2-(N, Nʺ) in 1 and 2.
► The photoluminescence for 1 and magnetic properties for 2has been discussed.