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Sökning: L773:2451 9294 > (2020)

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1.
  • Schmalzbauer, Matthias, et al. (författare)
  • Redox-Neutral Photocatalytic C-H Carboxylation of Arenes and Styrenes with CO2
  • 2020
  • Ingår i: Chem. - : Elsevier BV. - 2451-9308 .- 2451-9294. ; 6:10, s. 2658-2672
  • Tidskriftsartikel (refereegranskat)abstract
    • Carbon dioxide (CO2) is an attractive one-carbon (C1) building block in terms of sustainability and abundance. However, its low reactivity limits applications in organic synthesis as typically high-energy reagents are required to drive transformations. Here, we present a redox-neutral C-H carboxylation of arenes and styrenes using a photocatalytic approach. Upon blue-light excitation, the anthrolate anion photocatalyst is able to reduce many aromatic compounds to their corresponding radical anions, which react with CO2 to afford carboxylic acids. High-throughput screening and computational analysis suggest that a correct balance between electron affinity and nucleophilicity of substrates is essential. This novel methodology enables the carboxylation of numerous aromatic compounds, including many that are not tolerated in classical carboxylation chemistry. Over 50 examples of C-H functionalizations using CO2 or ketones illustrate a broad applicability. The method opens new opportunities for the valorization of common arenes and may find application in late-stage C-H carboxylation.
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2.
  • Yuan, Jun, et al. (författare)
  • Reducing Voltage Losses in the A-DAD-A Acceptor-Based Organic Solar Cells
  • 2020
  • Ingår i: Chem. - : CELL PRESS. - 2451-9308 .- 2451-9294. ; 6:9, s. 2147-2161
  • Tidskriftsartikel (refereegranskat)abstract
    • Power conversion efficiencies (PCEs) of solution-processed organic solar cells (OSCs) have recently reached 17.4% (certified) for single-junction devices. Crucial to this advancement is the development of non-fullerene acceptors (NFAs) since 2015. The recent A-DAD-A NFAs have attracted widespread attention because of their ladder-type electron-deficient-core-based central fused ring with improved transport properties and optimum energy levels. With the synergistic effect of electron-deficient-core and specific molecular geometry, the A-DADA molecules could achieve low voltage losses and high current generation at the same time, reaching new regimes of device physics and photophysics. This perspective will discuss the voltage losses in state-of-the-art A-DAD-A NFA-based OSCs and propose new molecular design strategies to achieve PCEs over 20% in OSCs based on these new acceptors by further decreasing their total voltage losses.
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