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- Title
Resolving Structures of Paramagnetic Systems in Chemistry and Materials Science by Solid‐State NMR: The Revolving Power of Ultra‐Fast MAS.
- Authors
Koppe, Jonas; Sanders, Kevin J.; Robinson, Thomas C.; Lejeune, Arthur L.; Proriol, David; Wegner, Sebastian; Purea, Armin; Engelke, Frank; Clément, Raphaële J.; Grey, Clare P.; Pell, Andrew J.; Pintacuda, Guido
- Abstract
Ultra‐fast magic‐angle spinning (100 kHz) has revolutionized solid‐state NMR of biomolecular systems but has so far failed to gain ground for the analysis of paramagnetic organic and inorganic powders, despite the potential rewards from substantially improved spectral resolution. The principal blockages are that the smaller fast‐spinning rotors present significant barriers for sample preparation, particularly for air/moisture‐sensitive systems, and are associated with low sensitivity from the reduced sample volumes. Here, we demonstrate that the sensitivity penalty is less severe than expected for highly paramagnetic solids and is more than offset by the associated improved resolution. While previous approaches employing slower MAS are often unsuccessful in providing sufficient resolution, we show that ultra‐fast 100 kHz MAS allows site‐specific assignments of all resonances from complex paramagnetic solids. Combined with more reliable rotor materials and handling methods, this opens the way to the routine characterization of geometry and electronic structures of functional paramagnetic systems in chemistry, including catalysts and battery materials. We benchmark this approach on a hygroscopic luminescent Tb3 complex, an air‐sensitive homogeneous high‐spin Fe2 catalyst, and a series of mixed Fe2 /Mn2 /Mg2 olivine‐type cathode materials.
- Subjects
PARAMAGNETIC materials; MATERIALS science; MATERIALS handling; ELECTRONIC structure; POWDERS
- Publication
Angewandte Chemie, 2025, Vol 137, Issue 1, p1
- ISSN
0044-8249
- Publication type
Academic Journal
- DOI
10.1002/ange.202408704