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Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

4.8K
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
4.8K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

10.0K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
10.0K
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

8.6K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
8.6K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

8.8K
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).
8.8K
Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

8.5K
In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
8.5K
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

4.0K
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
4.0K

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2D biphenylene: exciting properties, synthesis & applications.

Vinod Kumar1, Surender Pratap1, Brahmananda Chakraborty2,3

  • 1Department of Physics & Astronomical Science, Central University of Himachal Pradesh, Dharamshala, H.P. 176206, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 8, 2025
PubMed
Summary

This review covers biphenylene (BPN), a novel 2D carbon material, detailing its synthesis, properties, and applications. BPN shows promise for energy storage, catalysis, and sensing, complementing graphene research.

Keywords:
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Graphene's isolation spurred research into novel two-dimensional (2D) materials.
  • Biphenylene (BPN), a porous 2D carbon allotrope, has emerged with unique, tunable properties.
  • Existing research on BPN is extensive, yet comprehensive reviews are lacking.

Purpose of the Study:

  • To provide a comprehensive review of the advanced graphene family and 2D biphenylene (BPN).
  • To discuss the synthesis, properties, and applications of 2D BPN.
  • To serve as a valuable resource for researchers in materials science, physics, chemistry, and chemical engineering.

Main Methods:

  • Literature review of existing research on 2D materials, focusing on biphenylene.
  • Analysis of synthesis methods for 2D biphenylene.
  • Compilation and discussion of reported properties and applications of 2D biphenylene.

Main Results:

  • Biphenylene exhibits unique and tunable properties, making it suitable for various applications.
  • Key applications include hydrogen storage, batteries, sensing, and electrocatalysis.
  • Detailed information on BPN's characteristics, synthesis, and applications is presented.

Conclusions:

  • 2D biphenylene is a significant material with diverse potential applications.
  • This review consolidates current knowledge on BPN, highlighting its importance in nanotechnology.
  • The findings will aid professionals and researchers in advancing materials science and related fields.