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Related Concept Videos

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...
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...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
¹H NMR Signal Integration: Overview00:58

¹H NMR Signal Integration: Overview

The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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.
NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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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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A simple method for analyzing 51V solid-state NMR spectra of complex systems.

Annika Fenn1, Maria Wächtler, Hergen Breitzke

  • 1Institut für Physikalische Chemie, Friedrich-Schiller-Universität Jena, Jena, Germany.

Solid State Nuclear Magnetic Resonance
|May 24, 2011
PubMed
Summary

This study introduces a new method for analyzing (51)V-MAS-NMR spectra, crucial for understanding vanadium in biological systems. The findings help explain low-intensity signals in vanadium chloroperoxidase. Keywords: vanadium complexes, NMR spectroscopy, biological systems.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State NMR Spectroscopy
  • Bioinorganic Chemistry

Background:

  • Vanadium complexes are vital models for studying biological systems.
  • Uncommon spectral line shapes in (51)V-MAS-NMR spectra of vanadium complexes present analytical challenges.
  • These challenges hinder the interpretation of vanadium moieties in biological matrices like vanadium chloroperoxidase.

Purpose of the Study:

  • To investigate five vanadium complexes as models for biological systems using (51)V-MAS-NMR spectroscopy.
  • To develop and present a reliable method for analyzing uncommon (51)V-MAS-NMR spectra.
  • To determine key NMR parameters for these vanadium complexes.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy, specifically (51)V-Magic Angle Spinning (MAS) NMR.
  • Analysis of spectral line shapes attributed to differences in relaxation times between central and satellite transitions.
  • Determination of quadrupolar coupling constant (C(Q)), electric field gradient (EFG) tensor asymmetry (η(Q)), isotropic chemical shift (δ(iso)), chemical shift anisotropy (δ(σ)), and CSA tensor asymmetry (η(σ)).

Main Results:

  • All investigated vanadium complexes exhibited uncommon spectral line shapes.
  • A novel method for reliable analysis of these challenging spectra was successfully developed and presented.
  • Comprehensive NMR parameters, including C(Q), η(Q), δ(iso), δ(σ), and η(σ), were determined for the studied complexes.

Conclusions:

  • The developed spectral analysis method is effective for vanadium complexes with short relaxation times.
  • The findings provide a basis for understanding the low intensity of satellite sideband patterns in biological vanadium systems.
  • This research advances the analysis of (51)V-MAS-NMR spectra in bioinorganic chemistry.