Review
Chemistry, Multidisciplinary
Shigekazu Ito
Summary: This article provides an overview of recent muon spin rotation/resonance (mu SR) studies on phosphorus analogs of alkenes, anthracenes, and cyclobutane-1,3-diyls. It reveals the application of muons in producing short-lived paramagnetic species from unsaturated organic molecules containing phosphorus elements, contributing to the development of novel functional species and progress in muon science.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Omar Alami, Regis Laurent, Marine Tasse, Yannick Coppel, Vincent Colliere, Jerome Bignon, Jean-Pierre Majoral, Said El Kazzouli, Nabil El Brahmi, Anne-Marie Caminade
Summary: In this study, a novel approach for functionalizing graphene oxide (GO) surface with AB5 phosphorus dendron and dendrimer was reported. These functionalized macromolecules were grafted onto the GO surface via covalent bonding. The resulting materials were characterized and evaluated for their biological activity.
Article
Chemistry, Multidisciplinary
Shigekazu Ito, Hikaru Akama, Kenji M. Kojima, Iain McKenzie, Kazuaki Kuwahata, Masanori Tachikawa
Summary: Muon spin rotation experiments and computational analyses were conducted to investigate the regioselective addition of muonium to xanthene-9-thione and thioxanthene-9-thione, resulting in the formation of C-centered radicals. The transverse-field muon spin rotation (TF-μSR) experiments showed a significant increase in the muon hyperfine coupling constants (Aμ) for cyclic thioketones compared to muoniated thiobenzophenone, indicating the important role of the bridging chalcogen atom in promoting orbital overlap.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2023)
Review
Chemistry, Multidisciplinary
Yuying Jiang, Ke Yang, Menggang Li, Denghui Xu, Zhenhui Ma
Summary: This review discusses the recent advances in spin-related catalysts and provides insights into the mechanisms behind their enhanced catalytic activity. By classifying different regulation strategies, including theoretical and experimental approaches, and giving examples of representative catalysts, the important role of regulating spin configuration in electrocatalytic applications is demonstrated.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
G. De Thomasis, A. Galante, G. Fioravanti, L. Ottaviano, M. Alecci, G. Profeta
Summary: We calculate the spin-lattice relaxation time of water in contact with graphene oxide using molecular dynamics simulations. The water-graphene oxide interaction is characterized by calculating the relaxation properties of bulk water and the contact angle, and comparing them with experimental data. The effect of graphene oxide on the dynamics and relaxation properties of water in different conditions and concentrations is investigated. Despite the diamagnetic nature of graphene oxide, the confined bilayers strongly affect the longitudinal relaxation properties of interfacial water due to hydrogen bonds with oxygen groups, making it a promising platform for studying water dynamics in confined geometries and a potential contrast-agent for MRI applications.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Proceedings Paper
Physics, Atomic, Molecular & Chemical
Iain McKenzie, Joseph Cannon, Danaan Cordoni-Jordan
Summary: ALC-mu SR is used to characterize muoniated radicals formed by the reaction of Mu with cholesterol, showing that Mu adds to the secondary carbon of the C=C bond and the observed radical has Mu in the 6 beta position. A(μ) and D-μ(∥) decrease with increasing temperature due to intramolecular motion and both intramolecular motion and wobbling of the molecule, respectively. The Delta(0) resonance observed in dilute solutions of cholesterol is sensitive to the polarity of the solvent and its width depends on the viscosity of the solution.
HYPERFINE INTERACTIONS
(2021)
Article
Chemistry, Physical
N. A. Chumakova, Vorobiev A. Kh, D. A. Astvatsaturov, T. S. Yankova, A. T. Rebrikova, M. Matveev
Summary: The orientational alignment of graphene oxide membranes was quantitatively determined using the spin probe technique. The values of the orientational order parameters up to the 6th rank were obtained. It was found that nitroxide probes and Cu(ii) complexes effectively reflected the alignment of the membranes. Moreover, the orientation alignment of the membranes prepared by vacuum filtration and drying the graphite oxide suspension were significantly different, with the latter showing poor alignment.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Proceedings Paper
Physics, Applied
A. D. Pant, K. Ishida, A. Koda, S. Matoba, S. Nishimura, N. Kawamura, K. Shimomura
Summary: In order to find a new solid material for generating ultracold muon in vacuum, we studied polycrystalline SiC. Using conventional muon spin rotation and relaxation method, high relaxation rates of muon were observed at low transverse field. The relaxation rates were found to be the same at different temperatures in full-stop and half-stop cases, indicating less possibility of emission of ultracold muonium from the surface of SiC. Further studies in KCl, porous silica, and chevron-shaped electron-rich microporous materials are planned.
15TH INTERNATIONAL CONFERENCE ON MUON SPIN ROTATION, RELAXATION AND RESONANCE
(2023)
