Coordination-driven assembly of a 3d–4f heterometallic organic framework with 1D Cu4I4 and Eu-based chains: syntheses, structures and various properties

Abstract

A three-dimensional porous 3d–4f heterometallic organic framework, namely, {[Eu₃(Cu₄I₄)₃(INA)₉(DMF)₄]·3DMF}_n (YNU-2), was successfully prepared under solvothermal conditions. There are two different one-dimensional metal chains in the structure, namely, Cu₄I₄ and Eu^III-based chains, resulting in an excellent stability of the prepared sample. A N₂ sorption isotherm at 77 K revealed that the activated sample exhibits a Brunauer–Emmett–Teller surface area of 371 m² g⁻¹, while, YNU-2 can adsorb obviously higher CO₂ amounts than CH₄ at 273 K and 298 K under 1 atm because of the stronger interaction force between CO₂ and the porous skeleton. Furthermore, YNU-2 is highly efficient heterogeneous catalyst for chemical fixation of the CO₂ and epoxides into cyclic carbonates with a preferable recyclability. Taking into account its excellent stability, the prepared sample can be used to construct an electrochemical adapter sensor for detecting cocaine with a detection limit of 0.27 pg mL⁻¹ in the wide range of 0.001–0.5 ng mL⁻¹.