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Related Concept Videos

Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

2.7K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as...
10.5K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
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...
2.8K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.8K
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...
2.8K
Resonance02:52

Resonance

54.2K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
54.2K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

9.0K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
9.0K

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B63: The Most Stable Bilayer Structure with Dual Aromaticity.

Jinhuang Chen1, Rui Liao1, Linwei Sai2

  • 1State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China.

The Journal of Physical Chemistry Letters
|April 10, 2024
PubMed
Summary

Researchers discovered a stable bilayer boron cluster (B63) with unique dual aromaticity. This finding bridges the gap between boron clusters and borophene, potentially paving the way for new materials.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Quantum Chemistry

Background:

  • Bilayer boron clusters and borophene sheets have garnered significant interest.
  • The relationship between bilayer boron clusters and bilayer borophene remains unclear.

Purpose of the Study:

  • To investigate low-energy structures of the B63 cluster.
  • To explore the connection between bilayer boron clusters and bilayer borophene.

Main Methods:

  • Global structure search using a genetic algorithm.
  • Density functional theory (DFT) calculations for structural and electronic analysis.

Main Results:

  • Identified a stable Cs bilayer B63 structure with three interlayer B-B bonds.
  • Observed strong electronegativity and robust dual aromaticity in the bilayer structure.
  • Dual aromaticity arises from coupled sigma and pi electron currents.

Conclusions:

  • The stable bilayer B63 cluster serves as a potential precursor for bilayer borophene.
  • This discovery enriches the understanding of dual aromaticity in boron systems.