Division of Applied Chemistry, Graduate School of Natural Science and Technology , Okayama University , Tsushima , Okayama 700-8530 , Japan.
J Am Chem Soc. 2019 Jul 31;141(30):11852-11857. doi: 10.1021/jacs.9b06240. Epub 2019 Jul 22.
A series of axially chiral -xanthenoxanthenes (PXXs) were synthesized from 1,1'-bi-2-naphthol without optical resolution. These are the first examples of chiral PXXs. Among them, PXX with two naphthalene rings connected via a methylenedioxy bridge and a chiral axis displayed intense fluorescence (FL) and circularly polarized luminescence (CPL) both in solution (Φ of 0.72 and || of 1.4 × 10) and in the solid state (Φ of 0.13 and || of 4.8 × 10). The bridged structure of PXX adjusts the angle between the vectors of the electric and magnetic transition dipole moments, which is essential for showing intense CPL activity.
一系列轴手性-呫吨并呫吨（PXX）可以从 1,1'-联萘酚无需光学拆分来合成。这些是手性 PXX 的首例。其中，通过亚甲基桥和手性轴连接的两个萘环的 PXX 显示出在溶液中和固态中都有强烈的荧光（FL）和圆偏振发光（CPL）（Φ 为 0.72 和 || 为 1.4×10）（Φ 为 0.13 和 || 为 4.8×10）。PXX 的桥连结构调整了电和磁跃迁偶极子矢量之间的角度，这对于显示强烈的 CPL 活性至关重要。
