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Two-dimensional ENDOR-ESEEM correlation spectroscopy

Bar1, Poppl, Vega

  • 1Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 30, 2000
PubMed
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This study introduces a 2D experiment correlating electron-nuclear double resonance (ENDOR) and electron spin-echo envelope modulation (ESEEM) frequencies. This method effectively resolves overlapping spectra from paramagnetic centers, aiding in spectral assignment.

Area of Science:

  • Spectroscopy
  • Magnetic Resonance Imaging
  • Quantum Chemistry

Background:

  • Electron Paramagnetic Resonance (EPR) spectroscopy often suffers from overlapping spectra from multiple paramagnetic centers.
  • Distinguishing and assigning signals from different centers and nuclei is challenging.
  • Existing techniques may lack the resolution needed for complex systems.

Purpose of the Study:

  • To develop a novel 2D experiment correlating ENDOR and ESEEM frequencies.
  • To provide a method for unraveling and assigning complex ENDOR and ESEEM spectra.
  • To enhance spectral resolution for paramagnetic centers with overlapping EPR signals.

Main Methods:

  • A 2D experiment combining ENDOR and ESEEM detection using a modified stimulated echo pulse sequence.

Related Experiment Videos

  • Acquisition of a 2D data set by varying the time interval T between microwave pulses.
  • Fourier transformation (FT) of the T-dependent data to generate a 2D spectrum with cross-peaks.
  • Simulation of 2D ENDOR-ESEEM spectra for a model system (S=1/2 coupled to two I=1/2 nuclei).
  • Experimental demonstration on a Cu(2+)-doped l-histidine single crystal.

    • Main Results:

    • The 2D ENDOR-ESEEM correlation spectra successfully linked ESEEM and ENDOR signals belonging to the same paramagnetic center.
    • Projections of the 2D spectra yielded standard three-pulse FT-ESEEM and ENDOR spectra.
    • Simulations validated the feasibility of the experiment under various conditions.
    • The method was applied to a Cu(2+)-l-histidine system with overlapping spectra from multiple nuclei (N, Cl, H).
    • The ESEEM projection effectively disentangled the crowded ENDOR spectrum, resolving signals from two distinct Cu(2+) sites.

    Conclusions:

    • The developed 2D ENDOR-ESEEM correlation experiment is a powerful tool for spectral assignment in complex paramagnetic systems.
    • This technique significantly improves resolution and aids in the interpretation of overlapping EPR, ENDOR, and ESEEM spectra.
    • The method provides a reliable approach to differentiate signals from multiple, potentially similar, paramagnetic centers.