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Article
Enhancing the Sensitivity of Solid-State NMR Experiments with Very Low Gyromagnetic Ratio Nuclei with Fast Magic Angle Spinning and Proton Detection
Ames Laboratory Accepted Manuscripts
  • Amrit Venkatesh, Iowa State University and Ames Laboratory
  • Matthew J. Ryan, Iowa State University
  • Abhranil Biswas, Iowa State University
  • Kasuni C. Boteju, Iowa State University
  • Aaron D. Sadow, Iowa State University and Ames Laboratory
  • Aaron J. Rossini, Iowa State University and Ames Laboratory
Publication Date
6-4-2018
Department
Ames Laboratory; Chemistry
Report Number
IS-J 9683
DOI
10.1021/acs.jpca.8b05107
Journal Title
Journal of Physical Chemistry A
Abstract

Many transition metals commonly encountered in inorganic materials and organometallic compounds possess NMR-active nuclei with very low gyromagnetic ratios (γ) such as 89Y, 103Rh, 109Ag, and 183W. A low-γ leads to poor NMR sensitivity and other experimental challenges. Consequently, nuclei with low-γ are often impossible to study with conventional solid-state NMR methods. Here, we combine fast magic angle spinning (MAS) and proton detection to enhance the sensitivity of solid-state NMR experiments with very low-γ nuclei by 1–2 orders of magnitude. Coherence transfer between 1H and low-γ nuclei was performed with low-power double quantum (DQ) or zero quantum (ZQ) cross-polarization (CP) or dipolar refocused insensitive nuclei enhanced by polarization transfer (D-RINEPT). Comparison of the absolute sensitivity of CP NMR experiments performed with proton detection with 1.3 mm rotors and direct detection with 4 mm rotors shows that proton detection with a 1.3 mm rotor provides a significant boost in absolute sensitivity, while requiring approximately 1/40th of the material required to fill a 4 mm rotor. Fast MAS and proton detection were applied to obtain 89Y and 103Rh solid-state NMR spectra of organometallic complexes. These results demonstrate that proton detection and fast MAS represents a general approach to enable and accelerate solid-state NMR experiments with very low-γ nuclei.

Language
en
Publisher
Iowa State University Digital Repository, Ames IA (United States)
Citation Information
Amrit Venkatesh, Matthew J. Ryan, Abhranil Biswas, Kasuni C. Boteju, et al.. "Enhancing the Sensitivity of Solid-State NMR Experiments with Very Low Gyromagnetic Ratio Nuclei with Fast Magic Angle Spinning and Proton Detection" Vol. 122 Iss. 25 (2018) p. 5635 - 5643
Available at: http://works.bepress.com/aaron_sadow/57/