A series of chiral mechanochromic copper(I) cAAC (cAAC=cyclic (alkyl)(amino)carbene) complexes with a variety of amide ligands have been studied with regard to their photophysical and chiroptical properties to elucidate structure-property relationships for the design of efficient triplet exciton emitters exhibiting circularly polarized luminescence. Depending on the environment, which determines the excited state energies, either thermally activated delayed fluorescence (TADF) from LLCT states or phosphorescence from LLCT/LC states occurs. However, neither chiral moieties at the carbene nor at the carbazolate ligands provide detectable luminescence dissymmetries g . An exception is [Cu(phenoxazinyl)(cAAC)], showing orange to deep red TADF with λ =601-715 nm in solution, powders and in PMMA. In this case, the amide ligand can undergo distortions in the excited state. This design motif leads to the first linear, non-aggregated CPL-active copper(I) complex with g of -3.4 ⋅ 10 combined with a high radiative rate constant of 6.7 ⋅ 10 s .
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/chem.202300946 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
High-Performance Circular Polarization Multiple-Resonance TADF Molecules with Enhanced Long-Range Charge Transfer Based on Chiral Paracyclophane.
J Phys Chem Lett
December 2024
State Key Laboratory of Organic Electronics and Information Displays, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, P. R. China.
Circularly polarized multiple-resonance thermally activated delayed fluorescence (CP-MR-TADF) materials have received widespread attention in recent years, but it remains a formidable challenge to design high-performance CP-MR-TADF emitters concurrently exhibiting high quantum efficiency, narrowband emission, and high dissymmetry factor (). Here, we perform an in-depth theoretical investigation on the CP-MR-TADF materials based on [2.2] paracyclophane (pCp) derivatives.
View Article and Find Full Text PDFGenerating Strong Circularly Polarized Luminescence from Self-assembled Films of Chiral Selenium Nanoparticles and Upconversion Nanoparticles.
Angew Chem Int Ed Engl
December 2024
Jiangnan University, International Joint Research Laboratory for Biointerface and Biodetection, lihu road 1800#, 214122, Wuxi, CHINA.
Circularly polarized luminescence (CPL) has garnered significant research attention. Achieving a high luminescence dissymmetry factor (glum) is a key challenge in this field. Herein, we reported, for the first time, the fabrication of a chiral assembled film consisting of chiral D-/L-Selenium nanoparticles (D-/L-Se NPs) and DSPE-PEG-NH2 modified upconversion nanoparticles (DPNUCNPs) with remarkable CPL properties that were generated by the interfacial self-assembly technique.
View Article and Find Full Text PDFChiral effects at the metal center in Fe(III) spin crossover coordination salts.
J Phys Condens Matter
December 2024
Department of Physics and Astronomy, University of Nebraska-Lincoln, Jorgenesen Hall, 855 North 16th Street, Lincoln, Nebraska, 68588-0299, UNITED STATES.
Evidence of chirality was observed at the Fe metal center in Fe(III) spin crossover coordination salts [Fe(qsal)Ni(dmit)] and [Fe(qsal)(TCNQ)] from X-ray absorption spectroscopy at the Fe 2pcore threshold. Based on the circularly polarized X-ray absorption data, the X-ray natural circular dichroism seen [Fe(qsal)Ni(dmit)] and [Fe(qsal)(TCNQ)] is far stronger than seen for [Fe(qsal)Cl] suggesting this natural circular dichroism signature is a ligand effect rather than a result of just a loss of octahedral symmetry on the Fe core. The larger the chiral effects in the Fe 2p core to bound X-ray absorption, the greater the perturbation of the Fe 2pto 2pspin-orbit splitting seen in the X-ray absorption spectra.
View Article and Find Full Text PDFDiverse Transient Chiral Dynamics in Evolutionary Distinct Photosynthetic Reaction Centers.
J Chem Theory Comput
December 2024
Department of Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, P.R. China.
The evolution of photosynthetic reaction centers (RCs) from anoxygenic bacteria to higher-order oxygenic cynobacteria and plants highlights a remarkable journey of structural and functional diversification as an adaptation to environmental conditions. The role of chirality in these centers is important, influencing the arrangement and function of key molecules involved in photosynthesis. Investigating the role of chirality may provide a deeper understanding of photosynthesis and the evolutionary history of life on Earth.
View Article and Find Full Text PDFChiral Mesostructured Yb3+, Er3+ Codoped CeO2 with Upconverted Circularly Polarized Luminescence.
Chemistry
December 2024
Tongji University, School of Chemical Science and Engineering, 1239 Siping Road, Shanghai, CHINA.
Upconverted circularly polarized luminescence (UC-CPL) active organic and organic-inorganic composite materials have garnered increasing attention due to their vast potential applications in areas such as 3D displays, encryptions, spintronics and optoelectronic devices. However, effective methods for fabricating chiral inorganic materials exhibiting UC-CPL remain a challenge. Herein, we propose an approach for the synthesis of UC-CPL active chiral mesostructured CeO2 powders (CMCs) via a hydrothermal growth method, using L/D-aspartic acid as symmetry-breaking and structure-directing agents.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!