Synthesis and Luminescent Properties of 6-Methoxy-quinazolinone-pyridine Difluoroboron Dyes

6-Methoxyquinazolinone-pyridine difluoroboron dyes (BODIQPys) have been synthesized in two simple steps with 2-amino-5-methoxybenzamide and 2-methylpyridines as starting materials. These quinazolinone-based difluoroboron (BF2) complexes exhibited highly efficient green luminescence and remarkable fluorescence in the solid-state with very large Stokes shift (Delta lambda up to 220 tun in MeCN). The introduction of methoxy group at 6-position of BODIQPy caused the red-shifted emission by the enhancement of charge transfer property. The introduction of halogen atom at pyridine moiety of BODIQPy can tune the LUMO levels in regularity while their HOMO levels remain intact.