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Efficient Orthogonal Spin Labeling of Proteins via Aldehyde Cyclization for Pulsed Dipolar EPR Distance Measurements.
J Am Chem Soc
December 2024
State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
Pulsed dipolar electron paramagnetic resonance (PD-EPR) measurement is a powerful technique for characterizing the interactions and conformational changes of biomolecules. The extraction of these distance restraints from PD-EPR experiments relies on manipulation of spin-spin pairs. The orthogonal spin labeling approach offers unique advantages by providing multiple distances between different spin-spin pairs.
View Article and Find Full Text PDFEnhanced humic acid removal by sludge activated carbon/Fe composite in peroxymonosulfate activation: mechanism and performance.
Environ Sci Pollut Res Int
December 2024
School of Chemical Engineering and Technology, Guangdong Industry Polytechnic University, Guangzhou, China.
In subsurface water, humic acid (HA) can react with active chlorine to form carcinogenic compounds, posing ecological issues and health risks. This study aims to create sludge activated carbon (SAC), combine it with Fe, and activate peroxosulfate (PMS) to remove HA from water. To verify the successful modification of SAC, the physicochemical properties were characterized using various methods such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Brunauer Emmett Teller (BET) analysis, and X-ray photoelectron spectroscopy (XPS).
View Article and Find Full Text PDFDivalent Intermediates in Lanthanide-Based Photocatalysts: Spectroscopic Characterization and Reactivity.
Inorg Chem
December 2024
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 PDFExtended Tetrathiafulvalene Multi-Redox Systems Incorporating 4,5-Dihydroazuleno[2,1,8-ija]azulene Cores.
Angew Chem Int Ed Engl
December 2024
University of Copenhagen, Department of Chemistry, Universitetsparken 5, DK-2100, Copenhagen, DENMARK.
The introduction of 4,5-dihydroazuleno[2,1,8-ija]azulene as a central core between two 1,4-dithiafulvene (DTF) units provides a novel class of extended tetrathiafulvalene (TTF) electron donors. Herein we present the synthesis of such compounds with the azulenoazulene further expanded by annulation to benzene, naphthalene, or thiophene rings. Moreover, unsymmetrical donor-acceptor chromophores with one DTF and one carbonyl at the central core are presented.
View Article and Find Full Text PDFRegulation of multilayer long crystalline MoS by NiO-modified AlO for improved hydrodesulfurization of COS.
Environ Res
December 2024
Kunming University of Science and Technology, Kunming, 650500, China.
Activated alumina-based composite oxide support is a commonly used support in hydrodesulfurization (HDS) catalysts, which not only retains the performance advantages of each component in the composite oxide support, but also significantly improves the defects of a single activated alumina support, such as the strong metal-support force of interaction. In this study, NiO-AlO composite support was prepared by introducing NiO-modified AlO, and MoS/NiO-AlO catalysts were prepared for the hydrodesulfurization of COS by liquid phase reduction method. In the COS hydrogenation reaction, the MoS/NiO-AlO catalyst achieved complete conversion of COS at 220 °C and showed more than 99.
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