Sun Chao-Jing, Meng Guoyun, Li Ya, Wang Nan, Chen Pangkuan, Wang Suning, Yin Xiaodong
Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, P. R. China.
College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, P. R. China.
Inorg Chem. 2021 Jan 18;60(2):1099-1106. doi: 10.1021/acs.inorgchem.0c03196. Epub 2020 Dec 28.
BN-doped polycyclic aromatic hydrocarbons (PAHs) have attracted numerous attentions because of their fascinating optical and electronic properties. In this work, a series of electron-donor (amine)- and -acceptor (borane)-functionalized BN-doped polycyclic aromatic hydrocarbons were prepared to study the substituents' effect on the photophysical properties. As a result, the compound with both donor and acceptor, , exhibits both local emission (LE) and charge-transfer emission (CT) in polar solvents. Especially, the CT emission with a longer wavelength revealed a lifetime as long as millisecond time scale at room temperature, indicating typical phosphorescence characteristics. Low-temperature photoluminescent (PL) spectroscopy and a theoretical study were conducted to help to interpret this phenomenon, and it turned out to be the lowering of the S energy level of which makes the intersystem crossing favorable. Furthermore, fluoride anion titration experiments exhibit the application potential of the dual-emission phenomenon of for ratiometric sensory materials.
硼氮掺杂的多环芳烃（PAHs）因其迷人的光学和电子性质而备受关注。在这项工作中，制备了一系列电子供体（胺）和受体（硼烷）功能化的硼氮掺杂多环芳烃，以研究取代基对光物理性质的影响。结果，同时具有供体和受体的化合物 在极性溶剂中表现出局域发射（LE）和电荷转移发射（CT）。特别是，波长较长的CT发射在室温下显示出长达毫秒时间尺度的寿命，表明具有典型的磷光特性。进行了低温光致发光（PL）光谱和理论研究以帮助解释这一现象，结果表明 的S能级降低使得系间窜越变得有利。此外，氟离子滴定实验展示了 的双发射现象在比率传感材料方面的应用潜力。
