Enhancement of Circularly Polarized Luminescence from Pulsating Nanotubules.

Enhancing the dissymmetry factor (g lum ) is a crucial issue in developing circularly polarized luminescence (CPL) materials. Herein, based on supramolecular self-assembly of diethyl L-glutamate-cyanodiarylethene (L-GC) in mixed solution of EtOH-H 2 O with different water fraction, enhanced circularly polarized emission from pulsating nanotubules was realized. In the mixture of ethanol and water (30/70, v/v), L-GC self-assembled into roll-up-type dense nanotubes and showed l-CPL. Remarkably, by increasing the water fraction to 80% and 90%, the diameter of the roll-up nanotubes increased and the dissymmetry factor of the nanotubes was significantly enhanced from 6.9×10 -3  (dense nanotubes) to 3.7×10 -2 (loose nanotubes), because of the enhanced intermolecular interactions and more ordered supramolecular stacking when increasing the water fraction. This work provides an efficient way to realize the increase of the dissymmetry factor by only changing the composition of solvents. This article is protected by copyright. All rights reserved.