Systematic Studies on the Chelating Ligand Effects of Novel Borafluoronium Ions

Abstract

This study explores the synthesis and characterization of borafluoronium ions via a ligand-based strategy using bidentate amine and phosphine bases as chelating agents to cationic boronium ions.The borafluoronium complexes A–C were synthesized in high yields (80%–95%) and characterized using NMR spectroscopy and single crystal X-ray diffraction. Further investigations into the coordination of other bisphosphine ligands, such as dppe, rac-BINAP, and Xantphos, resulted in the formation of Lewis adducts rather than the desired borafluoronium ions. The challenges in isolating these species are attributed to steric and chelate effects inherent of the ligands, with NMR analysis providing insights into the coordination chemistry and stability of these complexes.This work advances the understanding of borafluoroniumion formation and the impact of ligand structure on their properties.