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Metal-free photocatalysts with charge-transfer excited states enable visible light-driven atom transfer radical polymerization.
Chem Commun (Camb)
December 2024
Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Metal-free donor-acceptor photocatalysts enable efficient O-ATRP under visible light, allowing for precise control over polymer molecular weight with low dispersity. These photocatalysts achieve sufficient reductive potential to drive the reaction in their charge-transfer (CT) excited state. The reported efficient photocatalytic O-ATRP has significant potential in scalable polymer synthesis and photolithography.
View Article and Find Full Text PDFUpcycling Iron Oxide Scale Slag into a High-Performance, Sustainable Ozone Catalyst.
Angew Chem Int Ed Engl
November 2024
School of Chemistry & Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China.
Upcycling iron slag into a monolithic catalyst has led to low-cost heterogeneous catalytic ozonation (HCO) strategies for water treatment. The primary industrial challenges are the low chemical oxygen demand (COD) reduction rate in treating authentic wastewater and difficulties sustaining close-loop reaction cycles. In this study, we present a monolithic catalyst transformed from low-cost iron oxide scale slag (IOS) for highly efficient, sustainable ozone catalysis.
View Article and Find Full Text PDFEffect of locally excited state on fluorescence transition dipole moment in quadrupolar molecules subjected to symmetry breaking charge transfer.
J Chem Phys
October 2024
Volgograd State University, University Avenue 100, Volgograd 400062, Russia.
In excited centrosymmetric donor-acceptor triads of type A-D-A or D-A-D, symmetry breaking charge transfer (SBCT) in polar media has been explored for a few decades. SBCT is accompanied by significant reorganization of the electronic structure of the molecule, which leads to a change in the fluorescence transition dipole moment (TDM). Previously, experiments revealed a 20%-30% reduction in TDM, which occurs on the timescale of SBCT.
View Article and Find Full Text PDFQuantitative Spectroscopic Analysis of Surface-Reaching Photoexcited Holes in g-CN/TiO Z-Scheme Heterojunctions.
ACS Appl Mater Interfaces
October 2024
Key Laboratory of Functional Molecular Solids Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China.
Article Synopsis
- The Z-scheme heterojunction effectively enhances photocatalytic performance, but there's limited quantitative research on its impact on surface-reaching photoexcited charges.
- This study quantitatively analyzed the concentration of surface-reaching photoholes in g-CN/TiO Z-scheme heterojunctions for the first time, showing that the concentration strongly depends on the g-CN content and interface characteristics.
- The findings reveal that an optimized Z-scheme heterojunction can increase the photohole concentration by almost 1.7 times compared to regular TiO, thanks to a unique charge transfer mechanism involving intrinsic interface defects that trap holes and promote charge separation.
Ultrafast Charge Separation Driven by Solvation-Coupled Intramolecular Torsion.
J Phys Chem A
October 2024
School of Sciences, Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, People's Republic of China.
Article Synopsis
- The study focuses on the charge separation process in a pyrene- and triarylamine-based donor-acceptor dyad through advanced spectroscopy techniques.
- Photoexcitation leads to rapid charge separation in polar solvents, influenced by the interaction between the molecular components and solvent dynamics.
- The findings indicate that the evolution of the charge transfer state is significantly driven by the solvent environment and intramolecular structural adjustments during the reaction.
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