“…In this context, tetracoordinated organoboron dyes represent an ideal choice to investigate such effects, given that the typically used boron diuoride groups (BF 2 ) are arranged out of plane and, thus, may induce molecular distortions. In addition to the well-known boron dipyrromethene (BODIPY) dyes, [45][46][47][48] where the BF 2 is linked to a dipyrromethene core, various analogous scaffolds, including azaBODIPYs, 12 BODIHYs (hydrazones), 49,50 boron-locked anilido pyridines, 51 bis(borondiuoride)-8-imidazodipyrromethenes (BOIMPYs) 52 and azaBOIMPYs, 53 have been developed to leverage the photophysical properties and applications of this class of dyes. A particularly notable scaffold from the structural viewpoint is the BOPHY core (bis(diuoroboron)-1,2-bis((1H-pyrrol-2-yl) methylene)hydrazine), featuring two BF 2 groups within a tetracyclic pyrrole-boron diuoride structure.…”