Precise values are reported for a quite large (95)Mo quadrupole coupling and an unusually large (95)Mo chemical shift anisotropy in MoS(2), values that have been retrieved by analysis of a well-resolved, highly complex 14.1 T (95)Mo MAS NMR spectrum displaying both the central and satellite transitions.
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http://dx.doi.org/10.1039/b926699b | DOI Listing |
Dalton Trans
August 2023
Departamento de Biología y Geología, Física y Química Inorgánica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, 28933 Móstoles, Madrid, Spain.
Polyoxometalate (POM) mesoporous silica-based materials with a low POM loading have been designed with hydrophilic and hydrophobic properties. These materials act as powerful heterogeneous catalysts in oxidative desulfurization (ODS), owing to their ability to adsorb both HO and sulphur-containing compounds from the model oil simultaneously. The formation of charge transfer salts through ion pair interaction with a choline functionality, available on the hybrid silica support, affords robust and recyclable heterogeneous catalysts for the ODS process under mild conditions (45 min and 40 °C).
View Article and Find Full Text PDFJ Phys Chem C Nanomater Interfaces
April 2021
National High Magnetic Field Laboratory, 1860 East Paul Dirac Drive, Tallahassee, FL 32310, USA.
Solid-state, natural-abundance Mo NMR experiments of four different MoS materials have been performed on a magnet = 19.6 T and on a new Series Connected Hybrid (SCH) magnet at 35.2 T.
View Article and Find Full Text PDFMagn Reson Chem
October 2017
ILV, UMR CNRS 8180, UVSQ, Versailles, 78035, Cedex, France.
Solid State Nucl Magn Reson
September 2018
Department of Chemistry and Biomolecular Sciences&Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario K1N6N5, Canada. Electronic address:
Carboxylate paddlewheels and their oxo-bridged analogues constitute ideal building blocks for the assembly of two- and three-dimensional framework materials. Here, we present a multinuclear (H, C, Nb, Mo) magnetic resonance study of solid samples of NbOCl(OPh) (1), Mo(OCMe) (2), and Mo(OCCHF) (3). High-resolution proton and C CP/MAS NMR spectra provide valuable information on structure and crystal symmetry and on cocrystallized solvent.
View Article and Find Full Text PDFInorg Chem
October 2015
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
A variety of crystalline alkali molybdate phases are characterized by (23)Na, (133)Cs, and (95)Mo magic-angle-spinning nuclear magnetic resonance (MAS NMR) to provide spectroscopic handles for studies of devitrification products in borosilicate nuclear waste glasses. The NMR parameters obtained from line-shape simulations are plotted as a function of various structural parameters to discern trends that may prove useful in the determination of unknown phases. These are applied to Cs3Na(MoO4)2, the most common precipitate found in cesium- and molybdenum-bearing model nuclear waste glasses, the crystal structure of which has not yet been determined, to provide structural constraints that may guide the refinement of powder X-ray diffraction data.
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