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Investigation of short-term chemical changes in stable ruthenium added to soil by using X-ray absorption fine-structure analysis.
Radiat Prot Dosimetry
November 2024
Department of Radioecology, Institute for Environmental Sciences, 1-7, Ienomae, Obuchi, Rokkasho, Kamikita, Aomori, 039-3212, Japan.
Article Synopsis
- - Radioactive ruthenium can be accidentally released from nuclear fuel reprocessing plants, but there's limited research on its environmental behavior due to its complicated chemical properties.
- - A study was conducted using X-ray absorption fine-structure analysis to examine different chemical forms of stable ruthenium (like RuO4, RuO2, Ru(NO)(NO3)3, and RuCl3) added to soil, revealing how they react and change over time.
- - Results indicated that some forms (e.g., RuO4 and RuCl3) change quickly when in soil, while others (like RuO2 and Ru(NO)(NO3)3) are stable, highlighting the importance of understanding the chemical forms of ru
Structural and Biological Studies of Bioactive Silver(I) Complexes with Coumarin Acid Derivatives.
Molecules
October 2024
Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland.
Two new Ag(I) complexes with coumaric carboxylic acid derivatives have been synthesized. Structural studies of these noncrystalline complexes have been performed using a methodology that combines laboratory and synchrotron techniques, supported by density functional theory calculations. The arrangement of ligands around the Ag(I) cation has been refined using infrared, extended X-ray absorption fine structure, and X-ray absorption near edge structure spectroscopies.
View Article and Find Full Text PDFOperando XANES Reveals the Chemical State of Iron-Oxide Monolayers During Low-Temperature CO Oxidation.
Chemphyschem
January 2025
Department of Materials Science and Applied Mathematics, Malmö University, SE-205 06, Malmö, Sweden.
We have used grazing incidence X-ray absorption near edge spectroscopy (XANES) to investigate the behavior of monolayer FeO films on Pt(111) under near ambient pressure CO oxidation conditions with a total gas pressure of 1 bar. Spectra indicate reversible changes during oxidation and reduction by O and CO at 150 °C, attributed to a transformation between FeO bilayer and FeO trilayer phases. The trilayer phase is also reduced upon heating in CO+O , consistent with a Mars-van-Krevelen type mechanism for CO oxidation.
View Article and Find Full Text PDFVisualizing the Structure and Dynamics of Transition Metal-Based Electrocatalysts Using Synchrotron X-Ray Absorption Spectroscopy.
ChemSusChem
September 2024
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China.
As the global energy structure evolves and clean energy technologies advance, electrocatalysis has become a focal point as a critical conversion pathway in the new energy sector. Transitional metal electrocatalysts (TMEs) with their distinctive electronic structures and redox properties show great potential in electrocatalytic reactions. However, complex reaction mechanisms and kinetic limitations hinder the improvement of energy conversion efficiency, highlighting the necessity for comprehensive studies on structure and performance of electrocatalysts.
View Article and Find Full Text PDFCopper-Based Complexes with Adamantane Ring-Conjugated (3,5-Dimethyl-pyrazol-1-yl)acetate Ligand as Promising Agents for the Treatment of Glioblastoma.
J Med Chem
June 2024
School of Science and Technology, Chemistry Division, University of Camerino, via Madonna delle Carceri (ChIP), 62032 Camerino, Italy.
The new ligand L, obtained by conjugating the bifunctional species bis(3,5-dimethylpyrazol-1-yl)-acetate and the drug amantadine, was used as a chelator for the synthesis of new Cu complexes -. Their structures were investigated by synchrotron radiation-induced X-ray photoelectron spectroscopy (SR-XPS), near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, and by combining X-ray absorption fine structure (XAFS) spectroscopy techniques and DFT modeling. The structure of complex was determined by single-crystal X-ray diffraction analysis.
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