Theoretical study on complexes and reactions of boron isotopic exchange separation with fluorinated anisoles as novel donors

Semi-empirical and ab initio density-functional theory (DFT) methods were evaluated for the description of isotope exchange reactions to produce enriched ¹⁰B species. We found that DFT calculations using M06-2X/6-311+G(3d,2p) functional and basis sets in combination with the SMD implicit solvation model were able to correctly predict the performance of various anisole-derived donor molecules. We confirmed that fluorination results in greatly increased separation factors, and successfully identified the o- and 2,4-difluorinated anisole as superior donors for chemical exchange distillation. These findings provide the basis for an efficient approach to rapidly screen and design new donor species. (author)