Self-Assembly of Amphiphilic Schiff Base and Selectively Turn on Circularly Polarized Luminescence by Al³⁺

Abstract

We designed glutamide-derived amphiphilic Schiff bases containing three different aldehyde moieties for the fabrication of circularly polarized luminescence (CPL) emitting materials. Upon self-assembly in acetonitrile, Schiff bases featuring 4-(dimethylamino)-2-hydroxylbenzaldehyde and 1-hydroxy-2-naphthaldehyde groups form supramolecular gels with twist and fiber structures, respectively, whereas Schiff bases featuring 2-hydroxy-1-naphthaldehyde groups form precipitation with flake structures. Although emission and circular dichroism signals can be detected from the supramolecular gels formed by amphiphilic Schiff bases, none of them exhibits a circularly polarized luminescence (CPL). Although Mg 2+ , Zn 2+ , and Al 3+ can significantly enhance the fluorescence of the Schiff bases, interestingly, only Al 3+ ion is able to turn on the CPL emission. This study on the one hand provides a simple method for the fabrication of CPL-emitting supramolecular materials and on the other hand offers a novel way for the sensing of aluminum ion with supramolecular materials.

In Situ Construction of Ag/TiO2/g-C3N4 Heterojunction Nanocomposite Based on Hierarchical Co-Assembly with Sustainable Hydrogen Evolution

“…Moreover, the heterogeneous structure with nanometer size can reduce the charge diffusion length and effectively facilitate the separation process of charge carriers at the interface, which is also confirmed with the steady-state and transient fluorescence spectrum. In view of the above results, the presently prepared new heterojunction materials provide an exploration of new catalyst fields such as water oxidation and self-assembled composites [52][53][54][55][56][57][58][59][60][61][62][63].…”

“…Contents (at.%) of prepared composites Ag/TiO2/g-C3N4-X (X = 1, 2, 3) from XPS data. C3N4-1 67 53. 3.37 24.43 3.42 1.25 Ag/TiO2/g-C3N4-2 56.69 3.25 22.19 12.95 4.92 Ag/TiO2/g-C3N4-3 40.84 3.06 20.76 25.61 9.73…”

Circularly Polarized Luminescence of Aluminum Complexes for Chiral Sensing of Amino Acid and Amino Alcohol

“…It was well established that the Schiff bases could effectively coordinate with metal ions. We have reported the coordination of amphiphilic Schiff bases with Al 3+ , where the complex was formed by amphiphilic Schiff bases bound to Al 3+ with a 1:1 molar ratio. Herein, the interaction between formed Schiff base and Al 3+ was investigated by absorption spectra and fluorescence spectra.…”

The Progress and Perspective of Organic Molecules With Switchable Circularly Polarized Luminescence

“…Thus, CPL with opposite handedness was obtained by tuning the nitrogen position and the metal additive. Aluminum ion (Al 3+ , AlCl 3 , ethanol) (Jin Q. et al, 2018) was found to turn-on the CPL of glutamide-derived amphiphilic Schiff base containing a 1-hydroxyl-2-naphthaldehyde group. Inhibition of photon-induced electron transfer (PET) or excited-state induced proton transfer (ESIPT) enhanced the blue emission and specific chirality transfer from the ligand to the chromophore resulted in observable CPL emission (465 nm, |g lum |∼6.21×10 −4 ).…”