Synthesis and Characterization of Co(II) Coordination Polymer with a Flexible Bidentate Ligand

Abstract

A coordination polymer, {[Co(bib)₃](BF₄)₂}_n, was prepared for the first time at room temperature via the reaction between cobalt(II) chloride and flexible linker ligand, 1,4-bis(imidazolyl)butane (bib), in the presence of sodium tetrafluoroborate using a three layers method. The compound was characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction. It crystallizes in the triclinic sp. gr. \(P\bar {1}\) with the unit cell parameters a = 9.8124(2), b = 22.1804(4), c = 26.9233(5) Å and α = 71.910(2)°, β = 89.418(2)°, γ = 86.992(2)°. In the polymeric structure of the compound, the cobalt(II) ions have the CoN₆ octahedral geometry and six bib-ligands are coordinated to one metal ion to form an open 3D 2-fold interpenetrated framework (α-polonium-type net, pcu).