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Aggregation-induced emission and absorption enhancement of mixed-valent rhenium oxide quantum dots by triethylamine: Implications for food safety monitoring.
J Hazard Mater
December 2024
Department of Chemistry, National Sun Yat-sen University, No. 70 Lienhai Rd., Kaohsiung 80424, Taiwan; Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, No. 70 Lienhai Rd., Kaohsiung 80424, Taiwan; School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, No.100, Shiquan 1st Rd., Kaohsiung 80708, Taiwan. Electronic address:
Food freshness monitoring and volatile amine detection are key to food safety. In this study, we demonstrated the applicability of mixed-valence rhenium oxide quantum dots (MV-ReOQDs), synthesized via the hydrothermal reaction of α-cyclodextrin and rhenium ion precursors, in triethylamine (TEA) sensing. Spectroscopic correlation techniques showed that the developed MV-ReOQDs possessed mixed-valent rhenium, α-cyclodextrin as capped ligand, partially carbonized surface, and amorphous phase structure.
View Article and Find Full Text PDFO Activation and Enzymatic C-H Bond Activation Mediated by a Dimanganese Cofactor.
J Am Chem Soc
January 2025
Department of Chemistry, University of California, Berkeley, California 94720, United States.
Dioxygen (O) is a potent oxidant used by aerobic organisms for energy transduction and critical biosynthetic processes. Numerous metalloenzymes harness O to mediate C-H bond hydroxylation reactions, but most commonly feature iron or copper ions in their active site cofactors. In contrast, many manganese-activated enzymes─such as glutamine synthetase and isocitrate lyase─perform redox neutral chemical transformations and very few are known to activate O or C-H bonds.
View Article and Find Full Text PDFTwo mixed-valent cerium oxo clusters: synthesis, structure, and self-assembly.
Front Chem
December 2024
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, China.
Studies on cerium oxo clusters (CeOCs) are not only significant for understanding the redox and hydrolysis behaviors of Ce(III/IV) ions but also crucial for the rational synthesis of novel clusters and nanoceria with specific Ce(III)/Ce(IV) ratios. Here, two sets of reactions were conducted using cerium nitrate and HO-oxidized cerium nitrate, resulting in the formation of two distinct mixed-valent CeOCs [Ce Ce O(OH)(PhCO)(DMF)] (Ce) and [Ce Ce O(OH)(PhCO)(DMF)] (Ce). These two clusters exhibit different structures and Ce(III)/Ce(IV) ratios, demonstrating the critical role of cerium oxidation states and the occurrence of redox reactions in cluster formation.
View Article and Find Full Text PDFPCET-driven Reactivity of Neptunyl(VI) Yields Oxo-bridged Np(V) and Np(IV) Species.
Chemistry
December 2024
University of Kansas, Department of Chemistry, 1567 Irving Hill Road, 66045, Lawrence, UNITED STATES OF AMERICA.
Article Synopsis
- Two unique polynuclear complexes of neptunium (Np) with mono-μ2-oxo structures were created through a reaction involving the neptunyl(VI) compound dissolving in methanol and the addition of a Schiff-base ligand.
- One complex forms a trimer with mixed-valent Np centers and two bridging μ2-oxos, while the other is a dimer with two Np centers and one bridging μ2-oxo.
- Studies show that an intermediate multinuclear species forms before the ligand binds to the metal, and the oxo-deficient nature of the final products results from the electron transfer and condensation reactions involved in the complex formation.
Isocyanide Ligation Enables Electrochemical Ammonia Formation in a Synthetic Cycle for N Fixation.
J Am Chem Soc
December 2024
Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.
Article Synopsis
- The study focuses on using transition metals, specifically rhenium, to split nitrogen (N) and form metal nitride complexes, which could lead to efficient electrochemical nitrogen fixation to create ammonia under mild conditions.
- The proposed nitrogen fixation cycle involves binding N to form a complex, cleaving the N bridge, and then undergoing proton/electron transfer to produce ammonia, while a catalyst must fulfill specific electronic requirements during these processes.
- The introduction of an isocyanide ligand in the rhenium system helps facilitate electron reduction and protonation, increasing the stability of the process and enabling ammonia production, demonstrating how modifying supporting ligands can improve reactivity in synthetic cycles for nitrogen conversion.
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