Manipulation of Molecular Aggregation States to Realize Polymorphism, AIE, MCL, and TADF in a Single Molecule

Abstract

Multifunctional emitting materials are scarce and need to be further explored. Now,anewly anthraquinone derivative,2 -(phenothiazine-10-yl)-anthraquinone (PTZ-AQ) was designed and synthesized and found to demonstrate polymorphism, multi-color emission, aggregation-induced emission (AIE), mechanochromic luminescence (MCL), and thermally activated delayed fluorescence (TADF) in its different solid forms.I ti ss hown for the first time that TADF properties of ac ompound can be systematically tuned via its aggregation state.T he optimized PTZ-AQc rystal shows as mall singlet-triplet energy splitting of 0.01 eV and exhibits red TADF with aphotoluminescence quantum yield as high as 0.848. This study shows that the unique multiple functions can be integrated into one single compound through controlling the aggregation states,w hich provides an ew strategy for the investigation and application of multifunctional organic materials.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Thermally Activated Delayed Fluorescence Materials: Towards Realization of High Efficiency through Strategic Small Molecular Design

“…Lee et al reported ar ather intriguing molecule with AIE and TADF properties that also showed polymorphism and mechanochromic luminescence (MCL) phenomenon within the individual molecule. [70] Five different aggregation states were found, including threed ifferent crystal structures. In this particular molecule of 2-(10H-phenothiazin-10-yl)anthracene-9,10-dione (PTZ-AQ) (Figure 14), the non-rigid structure helps to facilitate the AIE properties with ay ellow solid (Y-solid), ar ed solid (R-solid), ay ellow rod-like crystal (Ycrystal), an orange flake-like crystal (O-crystal), andared flakelike crystal, corresponding to different aggregate states.…”

AIEgen based polymorphs with solvent regulated crystal-to-crystal switch properties

“…The good molecule planarities of the fluorenone and carbazole units are conducive to the assembly of well-ordered structures. The chemical structure of the compound is confirmed by 1 H NMR, 13 C NMR, ESI-TOF and X-ray single-crystal structural analysis. The detailed synthesis procedure and characterization can be found in the ESI † ( Fig.…”

“…1a, DCzFO exhibits two absorption bands centered at 340 nm and 460 nm, which are respectively due to the p-p* transition and the ICT from the electron-donating carbazole units to the electron-accepting fluorenone unit. 13 Altering the solvent polarity shows no significant effect on the absorption spectra of DCzFO (Fig. 1a) but affects its FL emission remarkably (Fig.…”

“…Two polymorphs of DCzFO, an orange crystal (OC) and a red crystal (RC), with completely different emission were obtained by slow evaporation in solvents with different compositions and their single crystal structures were characterized to explore the relationship between their molecular stacking and emission properties. The results suggest that RC is compactly stacked due to the more planar molecular conformations and stronger intermolecular interactions, and thus exhibits 74 nm Shanxi Province 716000, P. R. China † Electronic supplementary information (ESI) available: Additional experimental data, including details of the synthesis, structural information for the compounds ( 1 H NMR, 13 C NMR and mass spectra), and crystal data. Fig.…”

AIEgen‐Based Fluorescent Nanomaterials for Bacterial Detection and its Inhibition

“…The contact of NPs with bacterial cell membrane directly, results in, the destruction of bacterial cell permeability. The NPs may interact with bacterial intracellular components like, DNA and proteins thereby disrupting the biological activities of bacterial membranes . Additionally, the generation of ROS by NPs may also cause the disruption of the bacterial cells.…”