Instability of actinide(IV) hexachloro complexes in room-temperature ionic liquid [BuMeIm]PF6 due to hydrolysis of the hexafluorophosphate anion

摘要

Visible/NIR spectrophotometry,solid-state NMR and spectroscopy reveal the hydrolysis of the PF_6~-anion in the room-temperature ionic liquid [BuMeIm]PF6,where BuMeIm+is 1-butyl-3-methylimidazolium,in the presence of water and AnCl_6~(2-),where An(IV) is Th(IV),Np(IV),and Pu(IV).Slow absorption spectra evolution of AnCl_6~(2-) solutions is finished by solid products' precipitation.Solids are attributed to the mixture of An(IV) phosphates and fluorophosphates.