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Efficient DNP at high fields and fast MAS with antenna-sensitized dinitroxides.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Dynamic Nuclear Polarization (DNP)

Background:

  • Dynamic Nuclear Polarization (DNP) enhances solid-state NMR sensitivity by transferring polarization from electron spins to nuclear spins.
  • Current polarizing agents show reduced efficiency at very high magnetic fields (≥18.8 T).
  • The structure of polarizing agents is critical for efficient DNP performance.

Purpose of the Study:

  • To develop novel water-soluble nitroxide biradicals for improved DNP performance at high magnetic fields.
  • To investigate the structural factors influencing DNP efficiency in water-soluble polarizing agents.

Main Methods:

  • Synthesis of novel water-soluble nitroxide biradicals with dihydroxypropyl antenna chains.
  • Solid-state NMR experiments at 18.8 T with 60 kHz MAS.
  • 2H Electron Spin Echo Envelope Modulation (ESEEM) measurements.
  • Molecular Dynamics (MD) simulations.
  • Experiments using deuterated samples.

Main Results:

  • A new radical, M-TinyPol(OH)4, achieved enhancement factors of ~220 at 18.8 T and 60 kHz MAS.
  • This represents a nearly twofold increase in enhancement compared to previous best-performing dinitroxides.
  • 2H ESEEM and MD simulations revealed that dihydroxypropyl chains limit solvent accessibility and restrict spin diffusion pathways.

Conclusions:

  • The novel dihydroxypropyl-functionalized nitroxide biradicals significantly outperform previous agents at high magnetic fields.
  • The structure, specifically the antenna chains, is crucial for optimizing polarization delivery to the bulk solution.
  • This work provides a rational basis for designing more effective DNP polarizing agents for high-field solid-state NMR.