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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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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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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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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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The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
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Structure determination of aligned systems by solid-state NMR magic angle spinning methods.

Benjamin J Gross1, Joseph M Tanski, Ann E McDermott

  • 1Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027, USA. bjg30@columbia.edu

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 6, 2005
PubMed
Summary
This summary is machine-generated.

Single crystal rotational echo double resonance (REDOR) experiments precisely determine 3D orientations of heteronuclear bonds in amino acids. This method accurately measures bond vector tilt angles, verified by X-ray diffraction.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Biology
  • Crystallography

Background:

  • Determining precise molecular orientations in solid-state samples is crucial for understanding biological structures.
  • Rotational Echo Double Resonance (REDOR) is a powerful NMR technique for measuring distances between nuclei.

Purpose of the Study:

  • To utilize single crystal REDOR experiments for determining the 3D orientation of heteronuclear bond vectors within amino acids.
  • To establish a method for measuring the polar tilt angle of bond vectors relative to the rotor fixed frame (RFF) in uniaxially aligned samples.

Main Methods:

  • Single crystal samples of amino acids were subjected to rotational echo double resonance (REDOR) experiments.
  • Analytical expressions were derived to describe REDOR curves for uniaxially aligned samples.
  • X-ray indexing was employed to verify the determined bond orientations.

Main Results:

  • Single crystal REDOR experiments successfully determined the 3D orientation of heteronuclear bond vectors.
  • The polar tilt angle of bond vectors relative to the RFF was accurately measured using a derived analytical expression.
  • Determined bond orientations achieved an accuracy of +/- 1 degree, confirmed by X-ray indexing.

Conclusions:

  • Single crystal REDOR is a highly accurate technique for orientational analysis of molecular bonds in solid-state systems.
  • This method provides precise structural information, complementing traditional crystallographic techniques.
  • The findings enable detailed characterization of molecular arrangements in crystalline amino acids.