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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Nuclear Cross-Effect NMR.

Zhenfeng Pang1, Jake Lumsden1, Kong Ooi Tan1

  • 1Chimie Physique et Chimie du Vivant, CPCV, CNRS UMR 8228, Sorbonne Université, Ecole normale supérieure, PSL University, F-75005 Paris, France.

The Journal of Physical Chemistry Letters
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This summary is machine-generated.

Researchers discovered a nuclear cross effect, a new polarization transfer mechanism in nuclear magnetic resonance (NMR). This finding expands on dynamic nuclear polarization (DNP) and could enhance NMR applications.

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Quantum Mechanics
  • Solid-State Physics

Background:

  • Dynamic nuclear polarization (DNP) significantly boosts Nuclear Magnetic Resonance (NMR) sensitivity.
  • While Overhauser DNP has a nuclear counterpart (NOE), cross-effect DNP was considered electron-mediated.
  • Pulsed cross-effect DNP faced hardware and model system limitations.

Purpose of the Study:

  • To present the first evidence of a nuclear counterpart to the cross effect, termed the nuclear cross effect.
  • To explore polarization transfer in a three-spin nuclear system.
  • To provide insights into the theoretical foundations of pulsed cross-effect DNP.

Main Methods:

  • Experimental verification using single-crystal 13C-15N-labeled glycine.
  • Comparison of results with analytical theory.
  • Validation through numerical simulations.

Main Results:

  • Demonstrated the existence and mechanism of the nuclear cross effect.
  • Experimental data aligned with theoretical predictions and simulations.
  • Successfully realized pulsed nuclear cross-effect in a model system.

Conclusions:

  • The nuclear cross effect mediates polarization transfer in three-spin nuclear systems.
  • This work overcomes previous challenges in pulsed cross-effect DNP.
  • The nuclear cross effect holds potential for advancing enhanced NMR applications.