Zhang Yuxia, Geng Zhongxing, Zhang Yu, Xu Zhaoran, Li Hang, Cheng Yixiang, Quan Yiwu
Key Lab of Mesoscopic Chemistry of MOE and 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.
J Phys Chem Lett. 2021 Apr 22;12(15):3767-3772. doi: 10.1021/acs.jpclett.1c00865. Epub 2021 Apr 12.
Supramolecular co-assembly provides a brand-new powerful strategy for regulating simple organic molecules into various hierarchical nano- and microstructures as smart functional materials. In particular, chiral supramolecular assemblies with strong fluorescent emission have received extensive attention for their application as circularly polarized luminescence (CPL) emitters. Herein, we synthesized three achiral pyrene derivatives, but only the chiral co-assembly (-NMe2-Py-2) can exhibit the regular and orderly helical nanofiber via π-π stacking interaction between chiral ,'-dimethyl-binaphthyldiamine enantiomers (-NMe2) and the achiral pyrene derivative (Py-2). Interestingly, this kind of 2:1 molar ratio (-NMe2)2-Py-2 co-assembly with a helical nanofiber structure can emit a strong deep blue CPL signal from the achiral pyrene-based emitter, and the dissymmetry factor value can reach 0.027 (λ = 423 nm) in the film from spin-coating.
超分子共组装为将简单有机分子调控成各种具有层次结构的纳米和微观结构作为智能功能材料提供了一种全新的有力策略。特别是，具有强荧光发射的手性超分子组装体因其作为圆偏振发光（CPL）发射体的应用而受到广泛关注。在此，我们合成了三种非手性芘衍生物，但只有手性共组装体（-NMe2-Py-2）能够通过手性N，N'-二甲基联萘二胺对映体（-NMe2）与非手性芘衍生物（Py-2）之间的π-π堆积相互作用展现出规则且有序的螺旋纳米纤维。有趣的是，这种具有螺旋纳米纤维结构的2:1摩尔比（-NMe2）2-Py-2共组装体能够从非手性芘基发射体发出强烈的深蓝色CPL信号，并且通过旋涂制备的薄膜中的不对称因子（g）值在λ = 423 nm时可达到0.027。
