Persistent and Predominantly Localized Boron Radical from the Reduction of a Three‐Dimensional Analogue of NHC‐Stabilized Borafluorenium.

In this contribution, we reported the three‐dimensional (3D) analogues of N‐heterocyclic carbene (NHC)‐stabilized 9‐borafluorenium and 9‐borafluorene radical. The radical was fully characterized by cyclic voltammetry (CV), UV‐Vis absorption spectroscopy, electron paramagnetic resonance (EPR) and single‐crystal X‐ray diffraction analyses. The distinct boron‐centered radical character of 9‐borafluorene radical was corroborated by DFT calculations and EPR analysis. [ABSTRACT FROM AUTHOR]