Zhang Yuxia, Li Hang, Geng Zhongxing, Zheng Wenhua, Quan Yiwu, Cheng Yixiang
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
Nat Commun. 2022 Aug 20;13(1):4905. doi: 10.1038/s41467-022-32714-1.
Chiral supramolecular assembly has been assigned to be one of the most favorable strategies for the development of excellent circularly polarized luminescent (CPL)-active materials. Herein, we report our study of an achiral boron-containing pyrene (Py)-based chromophore (PyBO) as a circularly polarized excimer emission (CPEE) dye induced by chiral co-assemblies containing chiral binaphthyl-based enantiomers (R/S-M). Chiral co-assembly R/S-M-(PyBO) fresh film spin-coated from toluene solution can exhibit orderly nanofibers and strong green CPEE (λ = 512 nm, g = ±0.45, Φ = 51.2 %) resulting from an achiral PyBO excimer. In contrast, only a very weak blue CPL was observed (λ = 461 nm, g = ± 0.0125, Φ = 19.0 %) after 187 h due to PyBO monomer emission as spherulite growth. Interestingly, this kind of chiral co-assembly R-M-(PyBO)-T film from tetrahydrofuran (THF) solution retains uniform morphology and affords the most stable and strongest CPEE performance (λ = 512 nm, g = + 0.62, Φ = 53.3 %) after 10 days.
手性超分子组装已被认为是开发优异的圆偏振发光（CPL）活性材料的最有利策略之一。在此，我们报道了对一种基于含硼芘（Py）的非手性发色团（PyBO）的研究，它作为一种由含手性联萘基对映体（R/S-M）的手性共组装诱导产生的圆偏振激基缔合物发射（CPEE）染料。从甲苯溶液旋涂得到的手性共组装R/S-M-(PyBO)新鲜薄膜能呈现出有序的纳米纤维，并由于非手性PyBO激基缔合物而产生强烈的绿色CPEE（λ = 512 nm，g = ±0.45，Φ = 51.2%）。相比之下，187小时后，由于PyBO单体发射形成球晶生长，仅观察到非常微弱的蓝色CPL（λ = 461 nm，g = ±0.0125，Φ = 19.0%）。有趣的是，这种从四氢呋喃（THF）溶液得到的手性共组装R-M-(PyBO)-T薄膜保持均匀的形态，并且在10天后提供最稳定和最强的CPEE性能（λ = 512 nm，g = +0.62，Φ = 53.3%）。
