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Spin probe for dynamics of the internal cluster in endohedral metallofullerenes.
Chem Commun (Camb)
December 2024
MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China.
Endohedral metallofullerenes (EMFs) are constructed by fullerene cages encapsulating various metal atoms or metal clusters, which usually exhibit some motion. However, due to the fact that the elusive endohedral dynamics are related to many factors, it remains a challenge to image the motion of internal species. Recently, the electron spin was found to be a sensitive probe to detect the motion of internal species in EMFs.
View Article and Find Full Text PDFQuantum Spin Probe of Single Charge Dynamics.
Phys Rev Lett
September 2024
Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA.
Article Synopsis
- Electronic defects in semiconductors are crucial for the development of quantum technologies, but accessing these defects at a single-particle level is challenging.
- A new method has been developed to investigate optically inactive spin defects, allowing researchers to observe semiconductor behavior at the atomic scale.
- By analyzing spin populations of single nitrogen spin defects in diamond using a nearby nitrogen vacancy center, the researchers measured defect ionization, enhancing understanding beyond traditional quantum sensing methods.
Theoretical terahertz spectroscopy of free radical solutes in solution: an EPR spin probe in water.
Phys Chem Chem Phys
November 2024
Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany.
Free radical species are used as spin labels in electron paramagnetic resonance (EPR) spectroscopy of biomolecular systems in water, for instance in the frame of Overhauser dynamic nuclear polarization (ODNP) relaxometry to probe the local hydration water dynamics close to protein surfaces in aqueous environments. Widely used in this context are nitroxide spin probes such as TEMPO, PROXYL or MTSL derivatives. Here, we study the THz spectroscopy of HMI (2,2,3,4,5,5-HexaMethylImidazolidin-1-oxyl) in water at ambient conditions which has been recently investigated as to how its EPR properties depend on its solvation pattern in water.
View Article and Find Full Text PDFAn electron paramagnetic resonance time-course study of oxidative stress in the plasma of electronic cigarette exposed rats.
Exp Physiol
September 2024
Center for Inhalation Toxicology, West Virginia University School of Medicine, Morgantown, West Virginia, USA.
Article Synopsis
- The long-term effects of electronic cigarette (Ecig) use on human health are still unclear, but existing research reveals that Ecig aerosols contain toxic compounds and can temporarily impair cerebral artery function.
- In a study with rats, researchers found that exposure to Ecigs led to increased oxidative stress markers in the blood, which correlated with impaired blood vessel reactivity, lasting up to 3 days post-exposure.
- Using electron paramagnetic resonance (EPR) spectroscopy, the study highlighted a significant relationship between elevated oxidative stress levels and reduced blood vessel function, emphasizing the potential negative health impacts of even a single hour of vaping.
Quantitative analysis of the slow exchange process by F NMR in the presence of scalar and dipolar couplings: applications to the ribose 2'-F probe in nucleic acids.
J Biomol NMR
December 2024
Laboratory for Dynamic Structure of Biomolecules, RIKEN Center for Biosystems Dynamics Research (BDR), 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan.
Solution NMR spectroscopy is a particularly powerful technique for characterizing the functional dynamics of biomolecules, which is typically achieved through the quantitative characterization of chemical exchange processes via the measurement of spin relaxation rates. In addition to the conventional nuclei such as N and C, which are abundant in biomolecules, fluorine-19 (F) has recently garnered attention and is being widely used as a site-specific spin probe. While F offers the advantages of high sensitivity and low background, it can be susceptible to artifacts in quantitative relaxation analyses due to a multitude of dipolar and scalar coupling interactions with nearby H spins.
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