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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Enhanced Aerogen-π Interaction by a Cation-π Force.

Junjian Miao1, Bo Song1, Yi Gao2

  • 1Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P.R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 25, 2015
PubMed
Summary
This summary is machine-generated.

Noble gas atoms interact more strongly with cation-π systems than previously thought. This enhanced aerogen-π interaction, driven by induction and dispersion forces, offers new insights into noble gas chemistry.

Keywords:
density functional calculationsenergy decomposition analysisnoble gasesnoncovalent interactionspi interactionssupramolecular chemistry

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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Inorganic Chemistry

Background:

  • Weak interactions between noble gases and aromatic systems are primarily due to London dispersion forces.
  • These weak aerogen-π interactions have historically received limited research attention.

Purpose of the Study:

  • To investigate and report a significantly enhanced aerogen-π interaction.
  • To explore the binding characteristics between cation-π systems and noble gas atoms.

Main Methods:

  • Computational chemistry methods were employed.
  • Energy-decomposition analysis was utilized to understand interaction components.

Main Results:

  • Divalent cation-π systems exhibit strong interactions with xenon, comparable to moderate hydrogen bonds (up to ~7 kcal/mol).
  • Krypton and argon also form notable, albeit weaker, interactions with cation-π systems.
  • Induction forces, in addition to dispersion, are key contributors to the stabilization of these complexes.

Conclusions:

  • The study reveals a powerful aerogen-π interaction involving cation-π systems.
  • Findings enhance the understanding of noble gas interactions and their potential roles in chemical systems.