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Related Concept Videos

Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

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...
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

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...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

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.
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

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Related Experiment Video

Updated: May 28, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Solution processable hydrogen-bonded perylene bisimide assemblies organizing into lamellar architectures.

Tomohiro Seki1, Yukihiro Maruya, Ken-ichi Nakayama

  • 1Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan.

Chemical Communications (Cambridge, England)
|October 19, 2011
PubMed
Summary

Solution-processable supramolecular assemblies were created using melamine and perylene bisimides. These assemblies form organized lamellar structures for use as electron transporting layers in organic field-effect transistors.

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Self-Assembly of Hybrid Lipid Membranes Doped with Hydrophobic Organic Molecules at the Water/Air Interface
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Last Updated: May 28, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Published on: February 7, 2017

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Self-Assembly of Hybrid Lipid Membranes Doped with Hydrophobic Organic Molecules at the Water/Air Interface

Published on: May 1, 2020

Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Organic Electronics

Background:

  • Perylene bisimides (PBIs) are excellent electron-accepting materials.
  • Achieving ordered structures from PBIs in solution is challenging.
  • Supramolecular chemistry offers routes to control material organization.

Purpose of the Study:

  • To develop solution-processable supramolecular assemblies using PBIs.
  • To create highly organized thin films for organic electronics.
  • To investigate the use of these assemblies as electron transporting layers.

Main Methods:

  • Synthesized a ditopic melamine bearing PBIs with swallow-tail alkyl chains.
  • Mixed PBIs with complementary hydrogen-bonding barbiturate or cyanurate to form supramolecular assemblies.
  • Processed the assemblies via spin-coating and thermal annealing.
  • Fabricated and tested organic field-effect transistors (OFETs) using the material as an electron transporting layer.

Main Results:

  • Achieved solubility of PBIs in organic solvents through supramolecular complexation.
  • Formed highly organized lamellar architectures upon spin-coating and annealing.
  • Demonstrated the functionality of the supramolecular assemblies as electron transporting layers in OFETs.

Conclusions:

  • Ditopic melamine-PBI assemblies provide a route to solution-processable, ordered materials.
  • The lamellar structures are suitable for efficient electron transport in OFETs.
  • Supramolecular strategies are effective for designing advanced organic electronic materials.