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Related Concept Videos

NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.3K
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...
1.3K
NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones01:15

NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones

4.4K
In aldehydes, the hydrogen atom connected to the carbonyl carbon helps distinguish aldehydes from other carbonyl compounds using ¹H NMR spectroscopy. The closeness of aldehydic hydrogen to the electrophilic carbonyl carbon highly deshields the hydrogen atom causing its signal to appear around 10 ppm in the ¹H NMR spectra. α hydrogens split the aldehydic proton signal, which helps identify the number of α hydrogens in the molecule. For instance, one α hydrogen creates a...
4.4K
NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

1.7K
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...
1.7K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.4K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.4K
NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

5.2K
Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
5.2K

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Mechanistic analysis by NMR spectroscopy: A users guide.

Yael Ben-Tal1, Patrick J Boaler1, Harvey J A Dale1

  • 1School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom.

Progress in Nuclear Magnetic Resonance Spectroscopy
|March 16, 2022
PubMed
Summary
This summary is machine-generated.

Solution-phase Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful, versatile tool for studying reaction mechanisms. This review details NMR techniques for quantitative analysis, structural elucidation, and mechanistic insights in organic and organometallic chemistry.

Keywords:
CatalysisDOSYData processingEquilibriumFlowIn situ analysisIsotopesKineticsMechanismNMRReaction monitoringTitrations

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Area of Science:

  • Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Organometallic Chemistry

Background:

  • Solution-phase Nuclear Magnetic Resonance (NMR) spectroscopy is a cornerstone technique in chemistry.
  • Its application in elucidating reaction mechanisms, particularly in organic and organometallic chemistry, is well-established.
  • However, a comprehensive guide to its practical application for mechanistic studies is often needed.

Purpose of the Study:

  • To provide a tutorial-style review of the principles and practice of solution-phase NMR spectroscopy for analyzing reaction mechanisms.
  • To summarize the unique advantages of NMR for quantitative, non-destructive analysis of organic and organometallic reactions.
  • To guide researchers in selecting and applying appropriate NMR techniques and equipment.

Main Methods:

  • The review covers general techniques and equipment for NMR analysis.
  • It details practical aspects of reaction setup, monitoring, data acquisition, and processing.
  • Specific methods discussed include NMR titrations, Diffusion Ordered Spectroscopy (DOSY), and the use of isotopes.

Main Results:

  • Solution-phase NMR offers quantitative, non-destructive analysis of diverse nuclei.
  • It provides detailed structural information crucial for mechanistic studies.
  • The review highlights 15 case studies demonstrating various advanced NMR techniques.

Conclusions:

  • Solution-phase NMR spectroscopy is uniquely effective for studying homogeneous reaction mechanisms.
  • The techniques discussed enable detailed mechanistic insights into organic and organometallic processes.
  • Routine availability of NMR instrumentation makes these methods accessible to most research labs.