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IR Frequency Region: Alkyne and Nitrile Stretching01:22

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Both alkyne (C≡C) and nitrile (C≡N) functional groups contain triple bonds and show stretching absorptions around the wavenumber range of 2100 to 2300 cm−1 in the diagnostic region of the IR spectra.
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Introduction:
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Probability Density Analysis Reveals Substantial Differences Between the Dinitrogen and Acetylene Triple Bonds.

Michel V Heinz1, Emma Gorgas1, Nicole Maser1

  • 1Institute of Physical Chemistry, RWTH Aachen University, Aachen, Germany.

Journal of Computational Chemistry
|February 4, 2025
PubMed
Summary

Electron positions maximizing probability density align with Lewis structures for most molecules, but not dinitrogen. This study revisits dinitrogen

Keywords:
Lewis structureschemical bondingprobability density analysisquantum Monte Carlowave function analysis

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Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Molecular Modeling

Background:

  • Previous studies indicated electron probability density maxima often mirror Lewis structures in small molecules.
  • This correlation holds for acetylene's triple bond but deviates for dinitrogen's triple bond.

Purpose of the Study:

  • To re-examine the peculiar case of dinitrogen's electron distribution.
  • To compare the wave function topology of dinitrogen with that of acetylene.
  • To elucidate the factors causing differences in electron positioning.

Main Methods:

  • Analysis of the dinitrogen wave function.
  • Comparative study with the acetylene wave function.
  • Investigation of electron exchange paths to understand delocalization.

Main Results:

  • Significant differences were found in electron positions maximizing probability density between dinitrogen and acetylene.
  • These discrepancies are attributed to the presence of hydrogen atoms in acetylene and specific electron arrangements in nitrogen and carbon atoms.
  • Electron delocalization insights were gained through analysis of electron exchange paths.

Conclusions:

  • The observed differences in electron positioning between dinitrogen and acetylene are explained by molecular composition and atomic electron arrangements.
  • These findings align with the distinct chemical behaviors of dinitrogen and acetylene.