Synthesis and Optical Properties of Polyaryl 2‐(Pyridin‐2‐yl)phenol‐Based Four‐Coordinate Organoboron Complexes

Comprehensive Summary A family of polyaryl 2‐(pyridin‐2‐yl)phenol‐based four‐coordinate organoboron complexes were prepared in good yields via deconstructive cycloaromatization of indolizines, cyclopropenones, and boric acids. The photoluminescence measurements have revealed that these N,O π ‐ conjugated tetracoordinate boron complexes display bright fluorescence, large Stokes shifts, and good quantum yields ( Φ lum = 0.15—0.45). In addition, the DFT calculations were carried out to deepen the understanding of the electronic structures and optoelectronic properties of these structurally unprecedented tetracoordinate boron complexes.