Luminescent Coordination Polymers Constructed from a Flexible, Tetradentate Diisopyrazole Ligand and Copper(I) Halides. Issue 5 (14th February 2020) - Yoneda, Tomoki
Abstract: One‐ and two‐dimensional coordination polymers composed of a structurally flexible, tetradentate diisopyrazole ligand and copper(I) halides were synthesized as crystalline solids. Complexation with copper(I) chloride or bromide resulted in the formation of infinite coordination chains through connecting each diisopyrazole ligand with two copper(I) ions in a trigonal planar coordination geometry. Contrarily, the combination of a diisopyrazole ligand and copper(I) iodide gave a two‐dimensional coordination network comprising Cu4 I4 units with stair‐step type geometry and diisopyrazoles that acted as both tetradentate and bidentate bridging ligands. All the coordination polymers exhibited visible photo‐emission upon UV irradiation, and the Cu4 I4 complex showed thermochromic behavior. Abstract : Luminescent one‐ and two‐dimensional coordination polymers were synthesized by complexation of ethylene‐bridged diisopyrazole ligand and copper(I) halide. While infinite coordination chains with trigonal planar copper(I) coordination geometry were formed from copper(I) chloride and bromide, coordination network composed of stair‐step type Cu4 I4 subunits was obtained from iodide. The Cu4 I4 ‐coordination network exhibited thermochromic emission behaviour in the solid state.