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Mass Spectrum: Interpretation01:24

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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 soft-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...
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Other Nuclides: 31P, 19F, 15N NMR01:16

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
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Mass Spectrometry of Amines01:15

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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule; a molecule with an odd number of nitrogen atoms produces a molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic...
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Mass Spectrometry: Amine Fragmentation00:55

Mass Spectrometry: Amine Fragmentation

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Amines can be identified using mass spectroscopy based on their characteristic fragmentation patterns. The molecular ions of amines undergo fragmentation via ⍺-cleavage. The ⍺-cleavage of the carbon-carbon bonds in amines generates an alkyl radical and resonance-stabilized nitrogen-containing cation.
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Mass Spectrometry: Long-Chain Alkane Fragmentation01:18

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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...
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Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Mass Spectrometric Study of NF2, NF3, N2F2, and N2F4.

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    This study measured appearance potentials for nitrogen-fluorine compounds, identifying ionization-dissociation pathways and calculating bond energies. The direct measurement of the F2N-NF2 bond dissociation energy provides key thermochemical data for these compounds.

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    Area of Science:

    • * Inorganic Chemistry
    • * Physical Chemistry
    • * Mass Spectrometry

    Background:

    • * Nitrogen-fluorine (N-F) compounds are important in various chemical applications.
    • * Understanding their fragmentation patterns and bond strengths is crucial for predicting reactivity and stability.
    • * Previous data on N-F compounds, including isomers of N2F2, were limited or required further validation.

    Purpose of the Study:

    • * To determine appearance potentials for ions derived from NF2, NF3, N2F2, and N2F4.
    • * To identify ionization-dissociation processes and calculate associated bond dissociation energies.
    • * To directly measure the bond dissociation energy of the F2N-NF2 bond and compile existing thermochemical data for N-F compounds.

    Main Methods:

    • * Measurement of appearance potentials using mass spectrometry.
    • * Calculation of bond dissociation energies from experimental data.
    • * Compilation and review of existing thermochemical and mass spectrometric data for N-F compounds.

    Main Results:

    • * Appearance potentials were successfully measured for selected ions from NF2, NF3, N2F2, and N2F4.
    • * Ionization-dissociation processes were identified, enabling the calculation of bond dissociation energies.
    • * The direct measurement of the F2N-NF2 bond dissociation energy yielded a value of 5.14±0.38 kJ/mole (21.5±1.6 kcal/mole).

    Conclusions:

    • * The study provides critical thermochemical data for nitrogen-fluorine compounds.
    • * The findings support the assignment of cis and trans structures for N2F2 isomers.
    • * This research contributes to a better understanding of the stability and fragmentation of N-F compounds.