Mixed-valence Ce/Zr metal-organic frameworks: controlling the oxidation state of cerium in one-pot synthesis approach

Abstract

The preparation of MOFs including a metal with an easily exchangeable oxidation state, while maintaining the same crystal structure and stability, is of paramount importance for myriad applications. In this work, a new synthesis method is reported that can be used to prepare Ce/Zr-MOFs (UiO-66 structure) having only Ce(III), a mixed-valence Ce(IV)/Ce(III), or only Ce(IV) cations, as desired. The materials are characterized using a large number of techniques, including X-ray absorption and X-ray photoelectron spectroscopies.