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Related Concept Videos

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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Aromatic Compounds: Overview01:25

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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.
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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Genetic Material01:20

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Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
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Dimensional Control in Contorted Aromatic Materials.

Samuel R Peurifoy1, Thomas J Sisto1, Fay Ng1

  • 1Department of Chemistry, Columbia University in the City of New York New York, New York, 10027.

Chemical Record (New York, N.Y.)
|January 22, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed contorted aromatic molecules, like graphene fragments, for advanced organic electronics. These higher-dimensional structures significantly boost material properties, leading to record efficiencies in solar cells and improved performance in other devices.

Keywords:
Contorted aromaticsEmergent propertiesGraphene nanoribbonsOrganic materials

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Nanotechnology

Background:

  • Graphene fragments like coronene, perylene, and pyrene are planar.
  • Organic electronic devices require materials with enhanced optical and electrical properties.

Purpose of the Study:

  • To detail advancements in the dimensional control of contorted aromatic molecules.
  • To explore the enhanced material properties of contorted aromatics compared to planar counterparts.

Main Methods:

  • Utilizing facile synthetic chemistry to contort graphene fragments into nanoribbons and nano-architectures.
  • Fabricating and testing devices such as organic photovoltaics, photodetectors, and field-effect transistors.

Main Results:

  • Contorted aromatics demonstrate reliably enhanced optical absorptivity, conductivity, and solubility.
  • Achieved world-record photoconversion efficiencies in organic solar cells.
  • Developed ultrathin, soluble graphene nanoribbons approximately 5 nm in length.

Conclusions:

  • Dimensional control of contorted aromatics offers a pathway to superior organic electronic materials.
  • These materials enable high-performance devices, including solar cells and photodetectors.
  • Contorted graphene architectures represent a significant advancement over planar or lower-dimensional analogues.