The first bimetallic Np(V) MOF with Np4Cs2O8 structural unit: sorption properties, thermal and radiation stability

Abstract

Synthesis, structure, and properties of the first anionic bimetallic NpCs MOF are reported. The structure of the obtained compound is based on a novel type of secondary building unit (SBU) - a Np₄Cs₂O₈ cluster. The SBU contains a set of cation-cation interactions NpO∙∙∙Np, Np∙∙∙Cs, and Cs∙∙∙Cs. The micropores of the new material were found to be too small to facilitate the sorption and ion exchange of ¹³⁷Cs. Limited pore size of the framework is 2.69 Å. The synthesized material is stable up to 400 °C, stable during hydrolysis and does not deteriorate at doses of at least 6 MGy. The NpCs MOF may be of interest separation of gases with small atom sizes, such as hydrogen isotopes and light noble gases.