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Broadband "infinite-speed" magic-angle spinning NMR spectroscopy.

Yan-Yan Hu1, E M Levin, Klaus Schmidt-Rohr

  • 1Ames Laboratory and Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.

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PubMed
Summary

High-resolution NMR of high-Z nuclei is improved by suppressing spinning sidebands. A modified 2D magic-angle-turning (MAT) experiment effectively removes sidebands in telluride materials, enabling accurate analysis.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Materials Science
  • Solid-state Chemistry

Background:

  • High-Z spin-1/2 nuclei NMR, crucial for materials like tellurides, faces challenges from large chemical-shift anisotropies.
  • These anisotropies generate strong spinning sidebands, obscuring essential centerband signals in fast magic-angle spinning (MAS) NMR.
  • Existing methods struggle to resolve signals in broad spectra (up to 200 kHz), hindering analysis of thermoelectrics and phase-change materials.

Purpose of the Study:

  • To develop a robust method for suppressing spinning sidebands in high-resolution NMR of high-Z nuclei.
  • To adapt and optimize the two-dimensional magic-angle-turning (MAT) experiment for broad spectra and fast MAS conditions.
  • To enable accurate peak identification and quantification in technologically relevant telluride materials.

Main Methods:

  • Adaptation of Gan's two-dimensional magic-angle-turning (MAT) experiment using five 90-degree pulses.
  • Implementation of corrections for long pulses and short rotation periods in fast MAS.
  • Application of the modified MAT experiment to telluride samples with wide spectral ranges (up to 170 kHz) at 22 kHz MAS.

Main Results:

  • The adapted MAT experiment effectively suppresses spinning sidebands over a wide spectral range.
  • Minimal spectral distortions and negligible residual sidebands were observed.
  • The method proved successful in analyzing technologically important tellurides, overcoming limitations of conventional MAS NMR.

Conclusions:

  • The modified 2D MAT NMR technique provides a powerful solution for sideband suppression in high-Z nuclei.
  • This advancement facilitates detailed analysis and characterization of materials like tellurides.
  • The method enhances the utility of solid-state NMR for studying materials with broad spectral features.