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Efficient deuterium-carbon REDOR NMR spectroscopy.

I Sack¹, S Vega

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

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|June 30, 2000

Summary

New phase modulated pulses enhance deuterium recoupling in (2)H-(13)C REDOR NMR spectroscopy. The XYXYX (PM5) pulse sequence significantly improved (13)C dephasing compared to other methods.

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Area of Science:

Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
Physical Chemistry
Organic Chemistry

Background:

Deuterium recoupling is crucial for (2)H-(13)C REDOR NMR spectroscopy to enhance (13)C dephasing.
Previous methods like CW recoupling and composite pulse schemes (CPL) have limitations in efficiency and signal intensity.

Purpose of the Study:

To investigate phase modulated pulses for improved deuterium recoupling in (2)H-(13)C REDOR NMR.
To experimentally and theoretically evaluate the deuterium inversion properties of these pulses.
To compare the effectiveness of different pulse sequences for (13)C dephasing.

Main Methods:

Experimental studies on l-alanine-2-d(1) using various deuterium recoupling pulse sequences.
Theoretical analysis using average Hamiltonian theory and exact simulations of the density matrix.
Comparison with 90-180-90 (CPL) and continuous wave (CW) recoupling pulses.
Application of the optimized PM5-REDOR technique to ethylmalonic acid-4-d(2).

Main Results:

The XYXYX (PM5) phase modulated pulse sequence demonstrated the best (13)C dephasing.
PM5 pulses offered a ~2.5-fold improvement in recoupling efficiency compared to CPL pulses.
Simulations indicated PM5-REDOR efficiency approaches that of REAPDOR, without the signal loss issues.
CW recoupling pulses showed the weakest (13)C dephasing.

Conclusions:

Phase modulated PM5 pulses represent a significant advancement for deuterium recoupling in (2)H-(13)C REDOR NMR.
The PM5-REDOR technique provides efficient (13)C dephasing and is suitable for structural studies, such as determining torsion angles.

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