Tuning the Circularly Polarized Luminescence of Supramolecules via Self-Assembly Morphology Control

Abstract

Tuning the circularly polarized luminescence (CPL) is a paramount yet challenging issue in the research field of chiral materials. Here, the chiral supramolecules were constructed with a chiral inducer LL-diphenylalanine (LPFF) and a triphenyl-1,3,5triazine-derived achiral molecule (DMAC-TRZ) to generate differentiated aggregates, giving rise to tunable responses of CPL. Specifically, the well-defined supercrystallines had an exceptional superior CPL emission located at 485 nm with a large luminescence dissymmetry factor (g lum ) value as high as +0.16, whereas the formed organic gel possessed a relatively strong CPL emission peaked at 495 nm with a g lum value of −0.04 in respect to the water fraction about 50%. The distinguished g lum value was assigned to the choice of spatial arrangement of the πchromophores of DMAC-TRZ responding to the volume water fraction in the H 2 O/DMSO system, resulting in a tunable g lum value. This strategy provides an efficient way to regulate CPL signals by modulating the π-stacking way of organic materials responding to external stimuli.

Circularly Polarized Luminescent Eu4(LR)4 Cage for Enantiomeric Excess and Concentration Simultaneous Determination of Chiral Diamines

“…As shown in Figure b, in a view along one edge of tetrahedron, two diol “arms” and two trifluoromethyl groups in two adjacent ligands form the multiple interweaved intramolecular interactions, which greatly increase the stability of molecular configuration, and make the point chirality more efficiently transfer to the skeleton. These kinds of weak interactions are generally observed in supramolecular self-assembly to regulate the structure and to amplify the chirality. − …”

Tuning the emission and lighting the circularly polarized luminescence of polyfluorene by incorporating a non-emissive polycarbene

“…[27][28][29][30][31][32][33][34] CPL materials emit circularly polarized light directly, and thus have been extensively explored in three-dimensional (3D) displays, information storage and processing, CPL lasers, biological probes, photocatalytic asymmetric synthesis, etc. [35][36][37][38][39][40][41][42] Therefore, developing novel organic CPL materials with tunable handedness and high dissymmetric factor is an interesting pursuit.…”

Synthesis and self-assembly of a diphenylalanine–tetraphenylethylene hybrid monomer and RAFT polymers with aggregation-induced emission

“…The combination of AIE molecules with self-assembling motifs via molecular modifications is promising in the fabrication of nano-and microstructures with tunable size/shape and fluorescent properties, which have great potential for applications in devices and sensors. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] Several synthetic approaches have been developed, which include the chemical linkage of AIE molecules with self-assembling motifs, [31][32][33][34][35][36][37][38][39][40][41] conjugation with chiral polymers, [42][43][44] and co-assembly of AIE molecules and self-assembling motifs. 45,46 The synthesized structures are mainly constructed via non-covalent bonds such as hydrogen bonding and hydrophobic and electrostatic interactions.…”

“…[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] Several synthetic approaches have been developed, which include the chemical linkage of AIE molecules with self-assembling motifs, [31][32][33][34][35][36][37][38][39][40][41] conjugation with chiral polymers, [42][43][44] and co-assembly of AIE molecules and self-assembling motifs. 45,46 The synthesized structures are mainly constructed via non-covalent bonds such as hydrogen bonding and hydrophobic and electrostatic interactions. [32][33][34][35][36][37][39][40][41][43][44][45][46] As a self-assembling motif, TPE molecules hybridized with amino acids or peptides show the ability to self-assemble into various structures, such as spheres, vesicles, and helical nano-and microfibers, which is achieved through specific interactions derived from amino acids or peptides.…”