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Related Concept Videos

Mass Spectrum01:23

Mass Spectrum

3.1K
A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x axis represents the ratio of the mass of the charged fragment to the elementary charge it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

1.1K
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
1.1K
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

2.0K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a low-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.
To...
2.0K
Mass Spectrometry: Long-Chain Alkane Fragmentation01:18

Mass Spectrometry: Long-Chain Alkane Fragmentation

2.0K
The molecular ions of linear alkanes prefer to fragment at the carbon-carbon bond away from the end of the chain since the cleavage of an inner bond creates a stable carbocation and a stable radical. Consequently, the mass signals of linear alkanes feature intense peaks in the middle of the mass-to-charge ratio plot with weaker peaks on either end. The fragmentation of each carbon-carbon bond with the release of a methyl group in each splitting leads to prominent peaks in the mass spectra...
2.0K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.3K
Mass Spectrometry: Branched Alkane Fragmentation01:29

Mass Spectrometry: Branched Alkane Fragmentation

1.3K
This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
1.3K

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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Ion spectroscopy in methane activation.

Jana Roithová1, Joost M Bakker2

  • 1Department of Spectroscopy and Catalysis, Radboud University Nijmegen, Nijmegen, The Netherlands.

Mass Spectrometry Reviews
|May 19, 2021
PubMed
Summary
This summary is machine-generated.

Ion spectroscopy reveals how metal ions and clusters interact with methane, influencing C-H bond vibrations. Metal clusters show enhanced reactivity in methane activation compared to single ions.

Keywords:
argon taggingion spectroscopymetal cationsmethane activationreaction intermediates

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Catalysis

Background:

  • Methane activation is crucial for energy applications.
  • Metal-ion complexes are key intermediates in methane activation.
  • Understanding these interactions requires detailed spectroscopic analysis.

Purpose of the Study:

  • To review ion spectroscopy studies on metal-methane complexes.
  • To elucidate the mechanisms of methane activation by metal ions and clusters.
  • To highlight recent advancements in the field.

Main Methods:

  • Ion spectroscopy to probe metal-methane interactions.
  • Analysis of C-H stretch vibration perturbations.
  • Characterization of reaction products using spectroscopy.

Main Results:

  • Electrostatic interactions lead to η³ methane coordination.
  • Orbital interactions result in η² methane coordination.
  • Metal clusters demonstrate higher reactivity in methane activation than individual ions.

Conclusions:

  • Ion spectroscopy provides insights into methane activation mechanisms.
  • Metal clusters represent promising catalysts for methane activation.
  • Further research on metal cluster interactions with methane is warranted.