of the transformable B–Cl moiety gave 9,10-dihydro-9-aza-10-boraanthracene derivatives with various aryl substituents. In addition, further functionalization on NH groups by alkylation and Buchwald–Hartwigamination was demonstrated. Photophysical properties of the resulting 9,10-dihydro-9-aza-10-boraanthracene derivatives were also discussed.
An air-stable B3,N2-PAH (B3N2; nine annulated six-membered rings) was synthesized from 1-X-2,6-di(azasilaanthryl)benzenes (X = Cl, I) via lithiation/borylation, electrophilic aromatic borylation, and Si/B exchange. The heteroatom distribution in B3N2 meets the requirements for multiple resonance thermally activated delayed fluorescence (MR-TADF). Indeed, B3N2 emits green light (λem = 523 nm; ΦPL =
由 1-X-2,6-二(氮杂硅蒽基)苯 (X = Cl, I) 通过锂化/合成空气稳定的 B 3 ,N 2 -PAH( B 3 N 2 ;九个环状六元环)硼化、亲电芳族硼化和 Si/B 交换。 B 3 N 2中的杂原子分布满足多重共振热激活延迟荧光(MR-TADF)的要求。事实上, B 3 N 2发射绿光(λ em = 523 nm;Φ PL = 85%;CHCl 3 ),fwhm 为 0.15 eV。在 PMMA 中测量了瞬时荧光(7.8 ns)和延迟荧光(60 μs)的寿命。
pi-Conjugated dendrons and dendrimers based on dibenzoazaborine were synthesized. The azaborine dendrons exhibited strong light absorption and photoluminescence, reflecting the optical properties of the azaborine. The fluorescence from the azaborine dendrimers bearing a benzothiadiazole core was strongly red-shifted or quenched, indicating photoinduced electron transfer from the azaborine dendrons to the core unit.