Light-emitting chiral carbonized polymer dots (Ch-CPDs) are attracting great interest because of their extraordinary photonic properties, but modulating their band-gap emission, especially at long wavelength, and maintaining their chiral structure to achieve multicolor, high-emission Ch-CPDs remains challenging. Reported here for the first time is the synthesis of red- and multicolor-emitting Ch-CPDs using the common precursors L-/D-tryptophan and o-phenylenediamine, and a solvothermal approach at one temperature. The quantum yield of the Ch-CPDs was between 31 % and 54 %. Supramolecular self-assembly provided multicolor-emitting Ch-CPDs showing novel circularly polarized luminescence, with the highest dissymmetric factor (g ) of 1×10 . Importantly, circularly polarized white-emitting CPDs were fabricated for the first time by tuning the mixing ratio of the three colored Ch-CPDs in a gel. This strategy affords exciting opportunities for designing functional chiroptical materials.
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http://dx.doi.org/10.1002/anie.202103336 | DOI Listing |
Angew Chem Int Ed Engl
January 2025
Zhengzhou University, College of Chemistry, No 100. Kexue Avenue, 450001, Zhengzhou, CHINA.
Chiral metal organic cage compounds with excellent circularly polarized luminescent performance have broad application prospects in many fields. Herein, two lanthanide complexes with luminescent properties in the form of racemic hexagonal octahedral cages were synthesized using a tri (β-diketone) ligand. Eu6(C21H6F15O6)8(H2O)6 exhibited red light emission with high quantum yields of 61%.
View Article and Find Full Text PDFDalton Trans
January 2025
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science Heilongjiang University, 74 Xuefu Road, Harbin 150080, China.
Herein, we report the influence of solvent on the self-assembly of a dinuclear helicate, (NMe)[Eu(LR)]. A multiple species mixture with the chemical composition of [Eu(LR)] present in CHCN can be transformed into a helicate upon increasing the content of CHCl, accompanied by a significant enhancement in circularly polarized luminescence activity.
View Article and Find Full Text PDFNat Mater
January 2025
Institute of Electrical and Microengineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
Chirality, a basic property of symmetry breaking, is crucial for fields such as biology and physics. Recent advances in the study of chiral systems have stimulated interest in the discovery of symmetry-breaking states that enable exotic phenomena such as spontaneous gyrotropic order and superconductivity. Here we examine the interaction between light chirality and electron spins in indium selenide and study the effect of magnetic field on emerging tunnelling photocurrents at the Van Hove singularity.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Zhengzhou University, College of Chemistry and Molecular Engineering, No.100 Science Avenue, Zhengzhou City, Henan Province P.R.China., Zhengzhou, Henan, CHINA.
We report a two-step approach to fabricate CsPbBr3 superstructures with strongly circularly polarized photoluminescence by self-assembly of nanoclusters on a substrate, followed by their annealing. In the first step, the nanoclusters self-assemble upon solvent evaporation, a process that forms mesoscopic superstructures whose geometrical arrangement at the µm-scale confers them optical chirality. In the second step, mild annealing of such superstructures induces the coalescence of the nanoclusters, accompanied by a continuous red shift of the photoluminescence up to 530 nm, with preservation of the µm-scale wires bundles and the chiral properties of the sample (glum = 0.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Okayama Daigaku Daigakuin Shizen Kagaku Kenkyuka, Division of Applied Chemistry, JAPAN.
Intramolecular aromatic oxidative coupling of 3,6-bis(m-terphenyl-2'-yl)carbazole provided a bis(m-terphenyl)-fused carbazole, while that of 3,6-bis(m-terphenyl-2'-yl)-1,8-diphenylcarbazole afforded a bis(quaterphenyl)-fused carbazole. Borylation of the latter furnished a B,N-embedded helical nanographene binding a fluoride anion via a structural change from the three-coordinate boron to the four-coordinate boron. The anionic charge derived from the fluoride anion is stabilized over the expanded p-framework, which leads to the high binding constant (Ka) of 1 × 105 M-1.
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