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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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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Double Resonance Techniques: Overview01:12

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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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¹H NMR of Labile Protons: Temporal Resolution01:10

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Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Atomic Nuclei: Magnetic Resonance01:05

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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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Proton-Based Ultrafast Magic Angle Spinning Solid-State NMR Spectroscopy.

Rongchun Zhang1, Kamal H Mroue1, Ayyalusamy Ramamoorthy1

  • 1Biophysics Program and Department of Chemistry, The University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States.

Accounts of Chemical Research
|March 30, 2017
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Summary
This summary is machine-generated.

This study presents new proton-based solid-state NMR (ssNMR) methods to enhance spectral resolution without deuteration. These techniques improve atomic-level structural insights into challenging molecular systems using ultrafast magic-angle spinning (MAS).

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (ssNMR) Spectroscopy
  • Atomic Resolution Structural Biology
  • Macromolecular Structure and Dynamics

Background:

  • Protons are abundant in macromolecules, offering high sensitivity for ssNMR studies.
  • Severe proton-proton dipolar couplings broaden spectral lines, limiting their use in ssNMR.
  • Advances in magic-angle spinning (MAS) probe technology have improved proton spectral resolution.

Purpose of the Study:

  • To review recent proton-based ssNMR strategies developed to enhance spectral resolution without chemical deuteration.
  • To gain atomistic-level insights into molecular structures of crystalline solid systems.
  • To illustrate the application of these techniques using small molecules and peptides.

Main Methods:

  • Utilizing ultrafast magic-angle spinning (MAS) frequencies up to 120 kHz for enhanced spectral resolution.
  • Developing and applying multidimensional NMR pulse sequences based on proton detection.
  • Leveraging proton-1H-1H dipolar couplings and chemical shift anisotropy (CSA) for structural information.

Main Results:

  • Demonstrated improved proton spectral resolution and sensitivity using proton-detected ssNMR under ultrafast MAS.
  • Enabled multidimensional NMR experiments involving low-gamma nuclei with enhanced resolution.
  • Successfully applied proton-based ssNMR to challenging crystalline systems, providing in-depth structural and dynamic information.

Conclusions:

  • Proton-based ssNMR under ultrafast MAS offers a powerful approach for studying molecular structures without deuteration.
  • Further developments in pulse sequences, MAS probes, and sample preparation are needed to overcome existing challenges.
  • Proton-based ssNMR is gaining popularity, particularly for protein studies, due to its sensitivity and potential for detailed structural analysis.