Shifting the emission of proton transfer fluorescence with fluorine-boron as the rotation lock

Abstract

A fluorine-boron (F-B) containing dye was configured and routinely characterized by nuclear magnetic resonance (NMR) and mass spectrometry (MS) technology. The absorption and emission behavior were investigated in selected solvent with different polarity. Both in chloroform and in solid powder state, it is highly emissive. The absolute fluorescence quantum yield was determined to be 0.60. The coordination lock of B atom prevents the free rotation of two fragment of the dye and limited the nonradiation transition, thus leading to the fluorescence emission character. In addition, significant Stoke’s shift (∼190 nm) was observed. Similar emission maximum in solution and solid shows that the emission behavior is insensitive to molecular aggregation behavior. In all the case, the emission colors were demonstrated by Commission internationale de l’éclairage (CIE) chromaticity system.