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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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

2D NMR: Overview of Heteronuclear Correlation Techniques

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

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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...
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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...

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Reference and normalization methods: essential tools for the intercomparison of NMR spectra.

Patrick Giraudeau1, Illa Tea1, Gérald S Remaud1

  • 1EBSI Team, Chimie et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes, CNRS, UMR 6230, LUNAM Université, B.P. 92208, 2 rue de la Houssinière, F-44322 Nantes Cedex 03, France.

Journal of Pharmaceutical and Biomedical Analysis
|August 20, 2013
PubMed
Summary

This review analyzes nuclear magnetic resonance (NMR) reference methods, offering a guide for selecting techniques based on experimental needs and applications. It details crucial parameters for accurate quantitative NMR analysis.

Keywords:
Chemical referenceElectronic referenceNMR spectrometryQuantitative NMR spectroscopyqNMR

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy

Background:

  • Quantitative nuclear magnetic resonance (qNMR) spectroscopy is a powerful analytical technique.
  • Accurate qNMR relies on the selection of appropriate reference methods and careful parameter optimization.

Purpose of the Study:

  • To review and analyze available reference methods for quantitative NMR.
  • To provide a decision-making tool for users selecting NMR methods based on experiments, samples, and applications.
  • To critically discuss the principles, performance, and applications of each method.

Main Methods:

  • Literature review of recent scientific publications on NMR reference methods.
  • Analysis of crucial parameters influencing accuracy in quantitative NMR.
  • Description of principles, analytical performance, and applications for each method.

Main Results:

  • A comprehensive overview of various NMR reference methods is presented.
  • Key parameters for achieving accuracy in qNMR are identified and discussed.
  • Recent applications of different qNMR methods are highlighted.

Conclusions:

  • The review serves as a guide for selecting appropriate qNMR reference methods.
  • Understanding critical parameters is essential for accurate quantitative NMR analysis.
  • This work facilitates informed choices for researchers utilizing qNMR techniques.