Syntheses of Diverse Donor-Substituted Bisbenzofuro[2,3-<i>b</i>:3′,2′-<i>e</i>]pyridines (BBZFPys) via Pd Catalysis, and Their Photophysical Properties
作者:Yuhei Itai、Yuji Nishii、Patrycja Stachelek、Przemyslaw Data、Youhei Takeda、Satoshi Minakata、Masahiro Miura
DOI:10.1021/acs.joc.8b01451
日期:2018.9.7
blue-to-green color region. The singlet–triplet energy splitting (ΔEST) was found to be much smaller than that of substituent-free BBZFPy (0.70 eV), ranging from 0.01 to 0.56 eV. The time-resolved spectroscopy revealed that the D–A compounds, comprising a bis(tert-butyl)carbazole as the D and CF3-attached BBZFPy as the A, showed delayed fluorescence (DF) in nonpolar matrix host material (Zeonex), while in
一系列具有氯官能团的双苯并呋喃[2,3- b:3',2'- e ]吡啶(BBZFPys)通过Pd催化的单氯代2的双氧化分子内C–H / C–H偶联而有效合成,6-二芳氧基吡啶。随后的Buchwald-Hartwig氯化BBZFPy胺化反应使新的一类供体-受体(D-A)π共轭化合物得以使用,该化合物包含BBZFPy作为电子受体(A)和二芳基胺作为供体(D)单元。对制备的D–A化合物的稳态光物理性质的研究表明,它们在溶液中和在蓝色至绿色区域的固态均具有发射性。单重态-三重态能量分裂(ΔE ST)被发现比不含取代基的BBZFPy(0.70 eV)小得多,范围为0.01至0.56 eV。时间分辨光谱显示,D-A化合物在非极性基质主体材料(Zeonex)中显示出延迟的荧光(DF),该化合物包括双(叔丁基)咔唑作为D和CF 3-附接的BBZFPy作为A。而在极性基质(DPEPO)中,微弱地观察到了室温