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NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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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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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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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...
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High-Resolution Mass Spectrometry (HRMS)01:15

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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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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Pure Shift Nuclear Magnetic Resonance: a New Tool for Plant Metabolomics
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High-resolution NMR spectroscopy for measuring complex samples based on chemical-shift-difference selection.

Ziqiao Chen1, Xueting Li1, 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, China. yulan.lin@xmu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|December 19, 2022
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Summary
This summary is machine-generated.

This study introduces a new Nuclear Magnetic Resonance (NMR) method using chirp excitation to overcome spectral congestion in proton NMR. The technique enables high-resolution 2D NMR for detailed molecular structure elucidation in complex samples.

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Area of Science:

  • Chemistry
  • Biochemistry
  • Metabonomics

Background:

  • Proton Nuclear Magnetic Resonance (NMR) spectroscopy is vital for molecular structure elucidation but suffers from spectral congestion.
  • Two-dimensional (2D) NMR methods can reduce congestion but face limitations in resolution and acquisition efficiency due to broad spectral bandwidths.

Purpose of the Study:

  • To introduce a novel NMR method for high-resolution 2D spectra acquisition.
  • To address spectral congestion and improve the extraction of coupling correlation networks and multiplet structures.

Main Methods:

  • Development of a new NMR method utilizing chemical-shift-difference selection via chirp excitation.
  • Application of the method to complex samples for detailed spectral analysis.

Main Results:

  • The proposed method successfully recorded high-resolution 2D NMR spectra.
  • Demonstrated effectiveness in identifying diastereotopic methylene protons and small frequency-difference coupled proton pairs in furanose, pyranose, and benzene rings.

Conclusions:

  • The novel NMR technique effectively overcomes spectral congestion in proton NMR.
  • This method is highly beneficial for molecular structure elucidation and composition analysis in complex chemical, biochemical, and metabolomic samples.