Tailoring the site effect of regioisomeric dimesitylboryl substituted pyrenes
Abstract
Dimesitylboryl substituted polycyclic aromatic hydrocarbons normally are strong emissive, and their photophysical properties are also greatly influenced by the position of substituent. To demonstrate this kind of siteeffect, a comparison study on exact regioisomeric dimesitylboryl-pyrene (PBs) derivatives was carried out in this work. The 4-substituted compound PB-4 was synthesized and structurally characterized. Generally, the absorption and emission properties of PB-4 in solution is quite similar with that of PB-1 rather than that of PB-2. However, the fluorescence quantum yield of PB-4 in solid reach up to 0.30, which is the highest among three PBs.