Three series of substituted 1,3,4-oxadiazoles were studied by (17)O NMR spectroscopy. Chemical shifts values were correlated with empirical Hammett parameters as well as calculated bond lengths and chemical shielding values.
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http://dx.doi.org/10.1002/mrc.2804 | DOI Listing |
Invest Radiol
October 2024
From the Research and Innovation Department, Guerbet, Roissy, France (I.M., M.-C.D.G., J.-F.M., A.D., Y.B., N.D., I.S., G.B., C.M., C.F., O.R., S.C.); General, Organic, and Biomedical Chemistry Unit, NMR and Molecular Imaging Laboratory, University of Mons, Mons, Belgium (C.H., S.L.); and Institute of Inorganic and Analytical Chemistry, University of Münster, Münster, Germany (C.K., T.J.M., U.K.).
Objectives: Gadopiclenol is a q = 2 pyclen gadolinium-based contrast agent (GBCA) recently approved by the Food and Drug Administration, European Medicines Agency, and other European countries. The aim of this report is to demonstrate its stability in multiple stressed in vitro conditions and in vivo, in rat kidney, while maintaining its higher relaxivity compared with conventional GBCAs on the market.
Materials And Methods: Both gadopiclenol and its chemical precursor Pi828-Gd were characterized and compared with q = 1 gadolinium (Gd) complexes.
Angew Chem Int Ed Engl
December 2024
Lehrstuhl für Anorganische Chemie und Strukturchemie, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany.
Fluoromethyl triflate (superfluoromethyl, SFM, FHCOSOCF) and fluoromethyl fluorosulfonate (magic fluoromethyl, MFM, FHCOSOF) are two easily synthesized, highly effective and non-ozone depleting fluoromethylation reagents. They are analogous to the well-known and widely used methylation reagents HCOSOCF and HCOSOF. Both SFM and MFM have been fully characterized by multinuclear NMR spectroscopy (H, C, O, F, S).
View Article and Find Full Text PDFHeliyon
February 2024
School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA.
Supramolecular chemistry explores non-covalent interactions between molecules, and it has facilitated the design of functional materials and understanding of molecular self-assembly processes. We investigate a captivating class of supramolecular structures, the guanidinium and hydrogen carbonate rosette layers. These rosette layers are composed of guanidinium cations and carbonate anions, exhibiting intricate hydrogen-bonding networks that lead to their unique structural properties.
View Article and Find Full Text PDFChemistry
January 2025
Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA.
Solid State Nucl Magn Reson
December 2024
Department of Mathematics, University of Colorado Denver, Denver, CO, 80204, USA.
O NMR methods are emerging as a powerful tool for determination of structure and dynamics in materials and biological solids. We present experimental and theoretical frameworks for measurements of O NMR relaxation times in static solids focusing on the excitation of the central transition of the O spin 5/2 system. We employ O-enriched NaNO as a model compound, in which the nitrate oxygen atoms undergo 3-fold jumps.
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