Peripherally Donor-Installed 7,8-Diaza[5]helicenes as a Platform for Helical Luminophores
Peripherally Donor-Installed 7,8-Diaza[5]helicenes as a Platform for Helical Luminophores
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DOI：
10.1055/a-1343-5810
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发表时间：
2021-01-28
影响因子：
2.6
通讯作者：
Takeda, Youhei
中科院分区：
文献类型：
--
作者：
Ikari, Yuta;Kaihara, Takahito;Takeda, Youhei
通过在7，8-二氮杂[5]螺烯核中引入两个电子给体作为一种新型的螺旋电子受体，开发了一类新的发射给体-受体-给体(D-A-D)化合物。X-射线结晶学分析揭示了这些化合物在固态中独特的扭曲和螺旋结构。值得注意的是，本文开发的一些D-A-D化合物在固态下显示出明显的机械变色发光(MCL)，而D-A-D螺烯显示出圆偏振发光(CPL)，其发光不对称因子g(Lum)约为10(-3)。时间分辨光谱分析揭示了螺烯类化合物的热激活延迟荧光特征。此外，还将发光螺烯作为发射体应用于有机电致发光二极管。
A new family of emissive donor-acceptor-donor (D-A-D) compounds has been developed by introducing two electron donors into the 7,8-diaza[5]helicene core as a novel helical electron acceptor. The X-ray crystallographic analyses revealed the uniquely twisted and helical structures of these compounds in the solid states. Notably, some D-A-D compounds developed herein display distinct mechanochromic luminescence (MCL) in the solid state, and a D-A-D helicene shows circularly polarized luminescence (CPL) with a relatively high luminescence dissymmetry factor g(lum) of ca. 10(-3). Time-resolved spectroscopic analysis revealed the aspects of thermally activated delayed fluorescence characters of the helicenes. Furthermore, the emissive helicenes were applied to organic light-emitting diodes as emitters.