Department of Chemistry and Biochemistry and California NanoSystems Institute (CNSI), University of California, Los Angeles, California 90095, USA.
Dalton Trans. 2020 Nov 25;49(45):16245-16251. doi: 10.1039/d0dt00826e.
Bromination of the luminescent borane, anti-B18H22, via electrophilic substitution using AlCl3 and Br2, yields the monosubstituted derivative 4-Br-anti-B18H21 as an air-stable crystalline solid. In contrast to the unsubstituted parent compound, 4-Br-anti-B18H21 possesses dual emission upon excitation with UV light and exhibits fluorescence at 410 nm and phosphorescence at 503 nm, with Φtotal = 0.07 in oxygen-free cyclohexane. Increased oxygen content in cyclohexane solution quenches the phosphorescence signal. The fluorescent signal intensity remains unaffected by oxygen, suggesting that this molecule could be used as a ratiometric oxygen probe.
通过使用 AlCl3 和 Br2 进行亲电取代反应，对发蓝光的硼烷 anti-B18H22 进行溴化，得到单取代衍生物 4-Br-anti-B18H21，它是一种在空气中稳定的结晶固体。与未取代的母体化合物相比，4-Br-anti-B18H21 在紫外光激发下具有双重发射，并在 410nm 处显示荧光，在 503nm 处显示磷光，在无氧环己烷中的总量子产率Φtotal 为 0.07。环己烷溶液中氧含量的增加会猝灭磷光信号。荧光信号强度不受氧的影响，这表明该分子可用作比率型氧探针。
