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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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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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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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
1.5K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

760
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...
760
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.7K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.7K
NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

3.1K
The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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Microscale NMR.

Andrew M Wolters1, Dimuthu A Jayawickrama, Jonathan V Sweedler

  • 1Department of Chemistry and the Beckman Institute, University of Illinois, Urbana 61801, USA.

Current Opinion in Chemical Biology
|November 5, 2002
PubMed
Summary
This summary is machine-generated.

Nuclear Magnetic Resonance (NMR) spectroscopy is advancing for analyzing small samples, enabling detection at picomole levels with microcoil probes and higher throughput. Techniques like capillary isotachophoresis/NMR improve sensitivity and on-line characterization of mixtures.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful analytical technique.
  • Characterizing small-volume samples presents unique challenges in sensitivity and analysis time.

Purpose of the Study:

  • To highlight the advancements in NMR spectroscopy for analyzing microliter and smaller-volume samples.
  • To demonstrate how new technologies enhance throughput and sensitivity in NMR analysis.

Main Methods:

  • Utilizing NMR spectrometers equipped with microcoil-based probes for enhanced sensitivity.
  • Employing NMR probes with multiple sample chambers for higher-throughput experiments.
  • Integrating capillary-scale separations with microcoil NMR, such as capillary isotachophoresis/NMR.

Main Results:

  • Identification of substances at picomole levels has been achieved.
  • Hyphenation techniques have significantly decreased the analysis time of complex mixtures.
  • Capillary isotachophoresis/NMR enables the use of high-mass sensitivity nanoliter-volume flow cells for microliter samples.

Conclusions:

  • Advances in NMR probe technology and hyphenation are expanding the applicability of NMR spectroscopy to increasingly smaller sample volumes.
  • On-line characterization of capillary separation processes is possible using the diagnostic capabilities of NMR.
  • The trend towards using NMR for smaller samples is growing due to these technological improvements.