Yang Li, Wang Fang, Auphedeous Dang-I Y, Feng Chuanliang
State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240, Shanghai, China.
Nanoscale. 2019 Aug 1;11(30):14210-14215. doi: 10.1039/c9nr05033g.
Although chiral functional materials showing circularly polarized luminescence (CPL) are being widely reported, it remains a challenge to provide convenient and universal strategies for constructing controllable CPL-active materials with a high luminescence dissymmetry factor (glum). Herein, the supramolecular chirality as well as the CPL handedness of phenylalanine-based hydrogels can be effectively regulated by commercial achiral naphthylamine isomers through non-covalent interactions. Typically, the co-assembled hydrogels exhibit considerably high |glum| values in the range of 5.62 × 10-3-8.74 × 10-3. The CPL inversion is mainly facilitated by intermolecular hydrogen bonds and π-π stacking between the achiral and chiral molecules, which might be induced by the reorientations of the assembled molecules. This work may provide an alternative method to construct tunable CPL-active materials.
尽管目前已广泛报道了具有圆偏振发光（CPL）特性的手性功能材料，但要提供便捷通用的策略来构建具有高发光不对称因子（glum）的可控CPL活性材料，仍然是一项挑战。在此，通过非共价相互作用，商业非手性萘胺异构体可有效调控基于苯丙氨酸的水凝胶的超分子手性以及CPL手性。具体而言，共组装水凝胶在5.62×10-3至8.74×10-3范围内表现出相当高的|glum|值。CPL反转主要由非手性分子与手性分子之间的分子间氢键和π-π堆积促进，这可能是由组装分子的重新取向引起的。这项工作可能为构建可调谐CPL活性材料提供一种替代方法。
