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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.3K
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...
3.3K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.4K
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...
3.4K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

11.5K
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.
11.5K
Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

12.1K
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 Hückel’s rule or the 4n +...
12.1K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.3K
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.
3.3K
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

13.5K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
13.5K

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Dimeric Cycloparaphenylenes with a Rigid Aromatic Linker.

Ke Li1, Zhanqiang Xu1, Han Deng1

  • 1Institute of Molecular Plus, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, 92 Weijin Road, Tianjin, 300072, China.

Angewandte Chemie (International Ed. in English)
|January 11, 2021
PubMed
Summary

New cycloparaphenylene (CPP) dimers exhibit dynamic flipping motion and emit brightly beyond 600 nm. These CPP derivatives form unique 1:2 host-guest complexes with C60, showcasing advanced molecular architectures.

Keywords:
cyclocondensationcycloparaphenylenefluorescencehost-guest complexespolycycles

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Area of Science:

  • Supramolecular Chemistry
  • Organic Materials Science
  • Photophysics

Background:

  • Cycloparaphenylenes (CPPs) are macrocyclic aromatic hydrocarbons with unique structural and electronic properties.
  • Developing CPP derivatives with controlled dynamic behavior and efficient luminescence is crucial for advanced materials.

Purpose of the Study:

  • To construct dimeric cycloparaphenylene (CPP) architectures with defined flipping motion.
  • To investigate the photophysical properties and host-guest complexation behavior of novel CPP dimers.

Main Methods:

  • Efficient cyclocondensation reaction for CPP dimer synthesis.
  • Variable-temperature nuclear magnetic resonance (VT-NMR) spectroscopy for conformational analysis.
  • Theoretical calculations to understand energy landscapes.
  • Photoluminescence spectroscopy to determine emission properties and quantum yields.
  • Host-guest complexation studies with C60.

Main Results:

  • Successfully synthesized dimeric CPP architectures exhibiting well-defined flipping motion.
  • VT-NMR and theoretical calculations revealed rapid cis-trans conformer interconversion at room temperature and a stable trans conformer at low temperatures.
  • The trihexylsilylethynyl-substituted CPP dimer demonstrated bright emission at 616 nm with an 80% quantum yield, the brightest CPP-based emitter beyond 600 nm.
  • A 1:2 host-guest complex between the CPP dimer and C60 was formed, exhibiting negative cooperativity.

Conclusions:

  • Novel dimeric CPPs with dynamic conformational flexibility have been synthesized.
  • These CPP derivatives serve as highly efficient emitters in the red spectrum.
  • The first example of a 1:2 host-guest complex involving CPP derivatives has been demonstrated, opening new avenues for supramolecular chemistry.