Design and synthesis of a chiral uranium-based microporous metal organic framework with high SHG efficiency and sequestration potential for low-valent actinides

摘要

The solvothermal reaction of [tris-(4-carboxylphenyl) phosphineoxide] (H3TPO) with UO2(NO3)(2)center dot 6H(2)O in DMF affords a uranium-based chiral, microporous, metal-organic framework compound [(CH3)(2)NH2]-[UO2(TPO)]center dot 4DMF center dot 12.5H(2)O (SCU-3) that exhibits the highest void volume (68.8%) and second-harmonic generation (SHG) efficiency (1.54 KDP) for an actinide compound reported to date. The combination of large channels and the coordination capabilities of P=O moieties in the structure enables SCU-3 to capture large amounts of Th(IV) from aqueous solutions, providing a new strategy for preparing heterobimetallic 5f/5f compounds, and may lead to applications in nuclear waste management.