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Divalent Intermediates in Lanthanide-Based Photocatalysts: Spectroscopic Characterization and Reactivity.
Inorg Chem
January 2025
Department of Chemistry, Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden.
The reduction of stable trivalent lanthanide species (Ln(III)) by the excited states of organic chromophores is the basis of photocatalytic divalent lanthanide-mediated reduction reactions. While indirect evidence of the photochemical formation of the reactive Ln(II) species is abundant, direct spectroscopic evidence of their presence is scarce. Here, nine chromophores with absorptions covering the near UV and visible ranges were systematically investigated in the presence of Ln(III) ions to evaluate their ability to reduce Eu(III) upon excitation with visible light to the catalytically active Eu(II) species.
View Article and Find Full Text PDFTransition Metal-Free Difunctionalization of Unactivated Alkenes: Arylation/Azidation, Arylation/Chlorination, and Arylation/Cyanation.
Chem
October 2024
Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States.
Arylethylamines represent a privileged scaffold in pharmaceutical compounds and form the backbone of many medical drugs, including those used for treating neurological diseases and pain. Their biomedical significance has inspired new synthetic methods that rely on transition metal-catalyzed aminoarylation reaction to an alkene, often in conjunction with a photoredox catalyst or a photosensitizer, and guided by a directing or stabilizing group. Here, we introduce a simple and effective method for azidoarylation of unactivated alkenes under transition metal-free conditions.
View Article and Find Full Text PDFIncarcerating bismuth nanoparticles into a thiol-laced metal-organic framework for electro and photocatalysis.
Mater Horiz
December 2024
Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
Article Synopsis
- * The incorporation of Bi nanoparticles is facilitated by thiol groups, which help bind bismuth precursors and control nanoparticle growth, leading to a composite structure with enhanced catalytic properties.
- * The BiNP@Zr-DMBD-1 composite exhibited high efficiency for CO electroreduction and showed effective degradation of methylene blue dye under blue LED light, demonstrating its potential for various catalytic applications.
Photocatalytic functionalization of white phosphorus with aryl bromides and chlorides.
Chem Commun (Camb)
September 2024
Universität Regensburg, Institut für Anorganische Chemie, 93040 Regensburg, Germany.
We report the implementation of a consecutive photoinduced electron transfer (conPET) strategy for the functionalization of white phosphorus (P) with inexpensive and widely available aryl bromides and chlorides. By employing a well-known acridinium-based photocatalyst under near-UV irradiation, this protocol gives direct access to valuable triarylphosphines and tetraarylphosphonium salts. The reaction mechanism is elucidated by NMR spectroscopic studies and model reactions.
View Article and Find Full Text PDFLight reception of Phycomyces revisited: several white collar proteins confer blue- and red-light sensitivity and control dynamic range and adaptation.
Photochem Photobiol Sci
August 2024
Departamento de Genética, Facultad de Biología, Universidad de Sevilla, 41012, Seville, Spain.
The giant-fruiting body, sporangiophore, of the fungus Phycomyces blakesleeanus grows toward near-UV/blue-light (phototropism). The blue-light photoreceptor, MadA, should contain FAD bound to the LOV domain, and forms a complex with MadB. Both proteins are homologs of white collar proteins WC-1 and WC-2 from the fungus Neurospora crassa and should be localized in nuclei, where they function as a light-sensitive transcription factor complex.
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