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Aromatic Hydrocarbon Anions: Structural Overview01:18

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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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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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Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Fused Aromatic Network Structures as a Platform for Efficient Electrocatalysis.

Javeed Mahmood1, Mohsin Ali Raza Anjum2, Jong-Beom Baek1

  • 1School of Energy and Chemical Engineering, Center for Dimension-Controllable Organic Frameworks, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST, Ulsan, 44919, South Korea.

Advanced Materials (Deerfield Beach, Fla.)
|December 15, 2018
PubMed
Summary
This summary is machine-generated.

Fused aromatic networks (FANs) are ordered porous polymers with tunable structures. These advanced materials show promise for developing efficient electrocatalysts in energy conversion and storage applications.

Keywords:
dimension controlelectrocatalystsenergy conversionenergy storagefused aromatic networks

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Fused aromatic network (FAN) structures are ordered porous polymers.
  • FANs feature tailorable structures with fused aromatic rings and no rotatable single-bond connectivity.
  • The geometry and space orientation of building blocks guide the topological expansion of FANs.

Purpose of the Study:

  • To summarize progress in 2D and 3D fused aromatic networks (FANs).
  • To highlight FANs as a platform for constitutional and functional design.
  • To explore FANs for developing efficient electrocatalysts for energy applications.

Main Methods:

  • Review of existing literature on 2D and 3D FANs.
  • Analysis of FANs' structural properties and design principles.
  • Evaluation of FANs' application in electrocatalysis for energy conversion and storage.

Main Results:

  • FANs offer a versatile platform for designing porous materials with tailored properties.
  • The absence of rotatable bonds in FANs allows precise control over structure and properties.
  • FAN architectures provide confined spaces for efficient exchange of energy carriers and guest molecules.

Conclusions:

  • Fused aromatic networks (FANs) are a promising class of materials for advanced applications.
  • FANs can be effectively utilized as platforms for developing high-performance electrocatalysts.
  • Further research into FANs will drive innovation in energy conversion and storage technologies.