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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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High-resolution NMR spectroscopy in inhomogeneous fields.

Zhong Chen1, Shuhui Cai1, Yuqing Huang1

  • 1Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, Fujian 361005, China.

Progress in Nuclear Magnetic Resonance Spectroscopy
|November 24, 2015
PubMed
Summary

High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy provides detailed molecular insights but is hindered by magnetic field inhomogeneity. This review explores complementary techniques for obtaining accurate NMR spectra even in non-ideal magnetic fields.

Keywords:
Inhomogeneous magnetic fieldNMR spectroscopyNutation echoesSpatial encodingiMQCs

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for analyzing molecular structure, conformation, composition, and dynamics.
  • A homogeneous magnetic field is typically required for high-resolution NMR, but field inhomogeneity poses a significant challenge.
  • Inhomogeneities can arise from experimental imperfections or sample magnetic susceptibility variations, limiting NMR applications.

Purpose of the Study:

  • To systematically review and describe techniques for acquiring high-resolution NMR spectra in the presence of magnetic field inhomogeneity.
  • To analyze the mechanisms, applicability, and efficiency of various established experimental approaches.
  • To highlight the complementary nature of these techniques for overcoming field inhomogeneity challenges.

Main Methods:

  • Review of established experimental approaches for NMR spectroscopy in inhomogeneous magnetic fields.
  • Systematic description of three main types of techniques.
  • Brief overview of additional high-resolution NMR methods and data processing strategies.

Main Results:

  • Multiple techniques exist to mitigate the effects of magnetic field inhomogeneity on NMR spectra.
  • Each technique possesses unique advantages and disadvantages for practical use.
  • No single method is universally applicable, underscoring their complementary roles.

Conclusions:

  • Various methods enable high-resolution NMR analysis despite magnetic field inhomogeneity.
  • Understanding the strengths and weaknesses of each approach is key to selecting the appropriate technique.
  • These complementary methods enhance the utility of NMR spectroscopy in challenging experimental conditions.