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Related Concept Videos

NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

1.4K
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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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

1.0K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
1.0K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

174
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...
174
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.1K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
1.1K
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

165
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...
165
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
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...
1.0K

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Pure Shift Nuclear Magnetic Resonance: a New Tool for Plant Metabolomics
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Combining Fast Pure Shift NMR and GEMSTONE-Based Selective TOCSY for Efficient NMR Analysis of Complex Systems.

Haolin Zhan1,2, Jiawei Liu1, Qiyuan Fang1

  • 1Department of Biomedical Engineering, Anhui Provincial Engineering Research Center of Semiconductor Inspection Technology and Instrument, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China.

Analytical Chemistry
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Summary

This study introduces a novel NMR protocol combining pure shift NMR and selective TOCSY for analyzing complex mixtures. The method enhances spectral resolution and simplifies crowded spectra, enabling detailed molecular analysis.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry

Background:

  • Liquid Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for molecular analysis.
  • Complex samples often present challenges due to crowded or overlapped spectra.
  • Existing NMR techniques struggle with intricate molecular structures and mixtures.

Purpose of the Study:

  • To develop an efficient NMR protocol for analyzing complex chemical systems.
  • To overcome spectral congestion and improve resolution in NMR analysis.
  • To enhance the capabilities of NMR spectroscopy for diverse chemical applications.

Main Methods:

  • Combines fast pure shift NMR with GEMSTONE-based selective TOCSY.
  • Utilizes ultrahigh-selective observation of coupling networks.
  • Employs sparse sampling and spectral reconstruction for accelerated acquisition.
  • Enhances spectral resolution and simplifies congested subspectra.

Main Results:

  • Achieved ultrahigh-selective observation in severely overlapped spectral regions.
  • Demonstrated enhanced spectral resolution and dissection of congested spectra.
  • Successfully applied the protocol to complex systems like estradiol, sugar mixtures, and grape juice.
  • Verified the protocol's feasibility, power, and potential for broad applications.

Conclusions:

  • The developed NMR protocol offers efficient analysis of complex systems.
  • It significantly improves spectral resolution and simplifies spectral congestion.
  • The method shows broad applicability across various chemical fields, including natural product analysis.