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Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization.

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New dinitroxide biradicals were tested as polarizing agents for dynamic nuclear polarization NMR. Longer relaxation times and deuteration improved performance, with one radical achieving record enhancements.

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Area of Science:

  • Chemistry
  • Physical Chemistry
  • Magnetic Resonance

Background:

  • Dynamic Nuclear Polarization (DNP) NMR enhances sensitivity.
  • Nitroxide radicals are crucial polarizing agents in DNP.

Purpose of the Study:

  • To synthesize and evaluate 37 new dinitroxide biradicals for DNP NMR.
  • To correlate radical structure and properties with DNP performance.

Main Methods:

  • Cross-effect DNP NMR experiments were conducted at 9.4 T and 100 K.
  • Polarizing agents were dissolved in 1,1,2,2-tetrachloroethane (TCE).
  • Electron and nuclear spin relaxation times were analyzed.

Main Results:

  • DNP performance strongly depends on substituents and relaxation times.
  • Longer relaxation times correlated with enhanced DNP signal.
  • Deuteration generally improved DNP enhancement but increased build-up time.
  • A novel radical demonstrated superior performance under tested conditions.

Conclusions:

  • Structural modifications and deuteration are effective strategies for optimizing DNP polarizing agents.
  • The newly developed radical represents a significant advancement for DNP NMR applications.