63525-48-4Relevant articles and documents
Confining perovskite quantum dots in the pores of a covalent-organic framework: quantum confinement- And passivation-enhanced light-harvesting and photocatalysis
Hai, Jun,Liu, Qiang,Meng, Genping,Sun, Dina,Sun, Shihao,Wang, Baodui,Zhang, Zefan,Zhen, Liping
supporting information, p. 24365 - 24373 (2021/11/17)
All-inorganic lead halide perovskites have attracted significant attention in artificial light-harvesting systems (ALHSs) due to their superior emission tunability and high light-absorption coefficients. However, their relatively low photoluminescence quantum yield (PLQY), surface defects, and poor thermal and air stability severely hinder their actual applications. Here, we demonstrate a simple and versatile method to grow monodisperse CsPbX3(X = Cl, Br, I) perovskite quantum dots (QDs) into the ordered mesopores of a thiol-functionalized covalent-organic framework (COF-SH) as emission-tunable antennas. Intriguingly, benefiting from the quantum confinement and defect-passivation, the resulting CsPbX3@COF-SH not only presents dramatically improved environmental and thermal stability, but also exhibits enhanced PLQY (30.2%), significantly higher than that of pristine CsPbX3perovskite bulk crystals (less than 1.0%). Importantly, the emission spectra of antennas could be precisely tuned by tailoring the halogen component to achieve the well-matched intersections between the emission peak of the antennas and the absorption peak of eosin Y (ESY) or rose bengal (RB) acceptor in ALHSs. As a result, the efficiency of energy transfer achieved from CsPbBr3@COF-SH to ESY and from CsPbBr2I@COF-SH to RB reached up to 94.4% and 93.6%, respectively. To better imitate natural photosynthesis, ESY-CsPbBr3@COF-SH and RB-CsPbBr2I@COF-SH systems were employed as photochemical catalysts for C-H selenation and cross-coupling/annulation reactions, respectively, and both systems showed elevated catalytic activity with excellent yields of up to 99.3% and 95.5% and far surpassing that of ESY or RB alone. This work clearly demonstrates the great advantages of COFs in the fabrication of embedded perovskite QDs with enhanced photoluminescence, thereby facilitating light-harvesting and promoting light-converting applications.
Benzo-Fused Perylene Oligomers with up to 13 Linearly Annulated Rings
Yang, Xuan,Rominger, Frank,Mastalerz, Michael
supporting information, p. 7941 - 7946 (2021/03/03)
The longer acenes with more than six linearly fused six-membered rings are still fascinating chemists and physicists because of their unique photophysical properties and their high potential for organic electronics applications. Unfortunately, with increasing size (seven and more rings) these compounds rapidly lose chemical stability. Besides kinetic and chemical stabilization approaches introducing either bulky or electron-withdrawing groups or both, such systems also have been stabilized by peri-annulation. Although strictly spoken, these peri-annulated compounds are no longer real acenes, they have fascinating properties as well. Herein, we describe the first synthesis of a new series of peri-annulated acenes with up to 13 linearly fused rings, which is unprecedented till date. Furthermore, this new series contains perylene units connected through benzene rings along their [b,k]edges, responsible for unique absorption and emission properties.
Modular Approach to the Synthesis of Two-Dimensional Angular Fused Acenes
Feofanov, Mikhail,Akhmetov, Vladimir,Sharapa, Dmitry I.,Amsharov, Konstantin
supporting information, p. 1698 - 1702 (2020/01/31)
Herein, we present a modular approach to pristine angularly fused planar acenes. The approach includes the Pd-catalyzed fusion of several building blocks and implements a dehydrative ?-extension (DPEX) reaction as a key step enabling facile access to diverse two-dimensional acenes. The scope was demonstrated on nine examples with up to quantitative yield.