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On the direct relation between REDOR and DIPSHIFT experiments in solid-state NMR.

Mukul G Jain1, G Rajalakshmi1, Vipin Agarwal1

  • 1TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally Village, Ranga Reddy District, Serilingampally, Hyderabad 500107, Telangana, India.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 30, 2019
PubMed
Summary
This summary is machine-generated.

Rotational-echo double resonance (REDOR) and Dipolar-coupling chemical-shift correlation (DIPSHIFT) are alternate implementations of the same solid-state NMR experiment. Both methods probe heteronuclear couplings, offering distinct advantages for specific applications.

Keywords:
DIPSHIFTFast MASHeteronuclear dipole-dipole couplingREDORSSNMR

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Materials science and structural analysis.

Background:

  • Rotational-echo double resonance (REDOR) and Dipolar-coupling chemical-shift correlation (DIPSHIFT) are key techniques in magic-angle-spinning (MAS) solid-state NMR.
  • These experiments are vital for investigating heteronuclear dipole-dipole couplings between spin-1/2 nuclei, offering robustness and clear data interpretation.

Purpose of the Study:

  • To demonstrate that REDOR and DIPSHIFT are fundamentally alternate implementations of the same NMR experiment.
  • To elucidate the theoretical similarities and practical differences between REDOR and DIPSHIFT.

Main Methods:

  • Analysis of REDOR and DIPSHIFT experimental designs and theoretical frameworks.
  • Comparison of pulse sequence strategies, specifically rotor-synchronization and pulse positioning.
  • Investigation of dipolar dephasing mechanisms in both REDOR and DIPSHIFT.

Main Results:

  • REDOR and DIPSHIFT are shown to be equivalent experimental approaches with shared underlying principles.
  • REDOR utilizes variable recoupling duration for dipolar dephasing, while DIPSHIFT employs a constant-time approach varying pulse positions.
  • Both methods modulate resonance intensity via recoupled phase factors.

Conclusions:

  • REDOR and DIPSHIFT, despite differing implementations, are interchangeable techniques for studying heteronuclear couplings in solid-state NMR.
  • Understanding their distinct operational modes allows for optimized application selection based on experimental needs.
  • This work clarifies their relationship, aiding researchers in choosing the most suitable sequence for their specific investigations.