Bai Xue, Sun Yimeng, Jiang Yuqian, Zhao Guangjiu, Jiang Jian, Yuan Chenhuan, Liu Minghua
Key laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China.
Department of Chemistry, School of Science, Tianjin University, Tianjin, 300354, China.
Angew Chem Int Ed Engl. 2021 Feb 15;60(7):3745-3751. doi: 10.1002/anie.202013550. Epub 2020 Dec 16.
The solvent-free organic π-liquids have been attracting increasing attentions owing to the inherent optoelectronic properties accompanied by the advantages of non-volatility and high processability. Herein, we reported a series of naphthalene derivatives substituted with chiral branched alkyl chains, which are present as liquids (Nap1-3) or solid (Nap4) at room temperature, depending on the substitution positions. Circular dichroism (CD) and circularly polarized luminescence (CPL) were only observed for enantiomeric Nap2 (2,3-substituted) liquid. It is suggested that the chiral aggregation in the π-liquid leads to the CD signal and the chiral excimer resulting in the CPL performance. When achiral anthracene or pyrene was dissolved in Nap2, the π-liquid could serve as chirality and energy transfer media in which both CD and CPL emerged from the achiral anthracene. A CPL dissymmetry factor (|g |) of anthracene reached to 5.2×10 when dissolved in chiral Nap2 liquid, which is nearly two orders of magnitude higher than that of the pure Nap2 π-liquid.
无溶剂有机π-液体因其固有的光电特性以及非挥发性和高加工性等优点而受到越来越多的关注。在此，我们报道了一系列被手性支链烷基链取代的萘衍生物，根据取代位置的不同，它们在室温下呈现为液体（Nap1 - 3）或固体（Nap4）。仅对映体Nap2（2,3 - 取代）液体观察到圆二色性（CD）和圆偏振发光（CPL）。这表明π-液体中的手性聚集导致了CD信号，而手性准分子导致了CPL性能。当非手性的蒽或芘溶解在Nap2中时，π-液体可以作为手性和能量转移介质，此时非手性的蒽会同时出现CD和CPL。当蒽溶解在手性Nap2液体中时，其CPL不对称因子（|g|）达到5.2×10，这比纯Nap2π-液体的该值高出近两个数量级。
