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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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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.
Due to the absence of continuous...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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.
Removing one hydrogen from the intervening CH2 group...
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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

5.5K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
5.5K
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

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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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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.0K
Carbocations02:10

Carbocations

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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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What does it take to stabilize a naphthalene anion?

Jozef Ďurana1, Barbora Kocábková1, Jozef Rakovský1

  • 1J. Heyrovský Institute of Physical Chemistry, v.v.i., Czech Academy of Sciences, Dolejškova 2155/3, 182 23 Prague, Czech Republic.

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Electron attachment to naphthalene clusters forms anions. The dimer anion requires Ar atom evaporation for stabilization, while larger clusters decay via naphthalene unit evaporation.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Materials Science

Background:

  • Naphthalene clusters are studied for their unique electronic properties.
  • Understanding electron attachment is crucial for molecular electronics and materials science.
  • Previous studies have explored electron interactions with smaller aromatic molecules.

Purpose of the Study:

  • To investigate the attachment of slow electrons to naphthalene clusters.
  • To determine the formation mechanisms and stability of naphthalene cluster anions.
  • To analyze the role of rare-gas atoms in stabilizing these anions.

Main Methods:

  • Crossed beam experiment with supersonic expansion of naphthalene.
  • Generation of neat and mixed naphthalene-rare gas clusters (He, Ne, Ar, Kr).
  • Mass spectrometry and measurement of electron energy-dependent ion yields.

Main Results:

  • The naphthalene dimer anion ((Np)2-) is not formed directly but via Ar evaporation from mixed clusters.
  • Larger naphthalene cluster anions (n>3) decay through naphthalene unit evaporation.
  • A self-scavenging process occurs around 6 eV, involving electronic excitation and trapping.
  • Mixed clusters with rare gases efficiently stabilize transient negative ions through atom evaporation.

Conclusions:

  • Naphthalene cluster anion formation is highly dependent on cluster size and composition.
  • Rare-gas atoms play a critical role in stabilizing naphthalene cluster anions.
  • Electron attachment dynamics reveal complex decay pathways including evaporation and self-scavenging.