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Related Concept Videos

Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
6.2K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.5K
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...
4.5K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

4.5K
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...
4.5K
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

16.0K
In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday...
16.0K
Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

15.5K
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...
15.5K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

4.4K
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.
4.4K

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Updated: Apr 19, 2026

Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids BPCA
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Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids BPCA

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Contorted polycyclic aromatics.

Melissa Ball1, Yu Zhong, Ying Wu

  • 1The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Optoelectronic Nano Materials and Devices Institute, Department of Chemistry, Shanghai Normal University , Shanghai 200234, China.

Accounts of Chemical Research
|December 20, 2014
PubMed
Summary
This summary is machine-generated.

Researchers designed "contorted aromatics," strained molecules that self-assemble into electronic materials. These disc and ribbon shaped materials show promise in organic electronics, including transistors and solar cells, with enhanced charge separation and high efficiency.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Polycyclic aromatic molecules are typically planar, limiting their self-assembly into complex 3D structures.
  • Strain engineering offers a route to distort planar aromatic systems, creating novel molecular architectures.

Purpose of the Study:

  • To design, synthesize, and assemble novel molecular materials from strained polycyclic aromatic molecules, termed "contorted aromatics."
  • To explore the self-assembly behavior and electronic properties of disc- and ribbon-shaped contorted aromatics.
  • To investigate their applications in organic electronic devices such as field-effect transistors and photovoltaic cells.

Main Methods:

  • Synthesis of strained polycyclic aromatic molecules with distorted, non-planar geometries.
  • Characterization of molecular conformations and self-assembly into columnar superstructures (discs) or helical ribbons (ribbons).
  • Fabrication and testing of electronic devices (field-effect transistors, solar cells) utilizing these materials.

Main Results:

  • Disc-shaped contorted aromatics self-assemble into photoconductive columns, forming p-type materials for transistors and enabling molecular recognition with fullerenes.
  • Ribbon-shaped contorted aromatics function as electron-transporting materials in transistors and achieve record efficiencies in non-fullerene solar cells when paired with donor polymers.
  • Interfaces between contorted discs and fullerenes act as molecular p-n junctions, significantly enhancing photoinduced charge separation in photovoltaic devices.

Conclusions:

  • Contorted aromatics represent a versatile class of building blocks for advanced self-assembled electronic materials.
  • Their unique 3D structures enable tailored electronic properties and novel interfacial phenomena, leading to improved device performance.
  • Future research can merge the properties of disc- and ribbon-shaped contorted aromatics for synergistic effects in organic electronics.