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Related Concept Videos

Molecular Compounds: Formulas and Nomenclature03:10

Molecular Compounds: Formulas and Nomenclature

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Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. 
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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.
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π Molecular Orbitals of the Allyl Radical01:27

π Molecular Orbitals of the Allyl Radical

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Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
The allyl systems have identical molecular orbitals but differ in the number of π electrons....
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π Molecular Orbitals of the Allyl Cation and Anion01:18

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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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Molecular Orbital Theory I02:35

Molecular Orbital Theory I

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Overview of Molecular Orbital Theory
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π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds
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π-Conjugated Compounds for Molecular Materials.

Satoru Hiroto1, Jishan Wu2

  • 1Graduate School of Human and Environmental Studies, Kyoto University, Yoshidanihonmatsu-cho, Sakyo-ku, Kyoto, 606-8501, Japan.

Chemistry, an Asian Journal
|May 3, 2019
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This summary is machine-generated.

This special issue explores the chemistry of π-conjugated systems, focusing on their depth and properties. Discover advancements in conjugated compound research and applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Focuses on π-conjugated systems, crucial for organic electronics and photonics.
  • Highlights the importance of understanding the depth of conjugation.

Discussion:

  • Explores the synthesis and characterization of novel π-conjugated compounds.
  • Discusses structure-property relationships in conjugated materials.

Key Insights:

  • Advances in tuning electronic and optical properties through conjugation.
  • New methodologies for creating complex conjugated architectures.

Outlook:

  • Future directions in π-conjugated system research.
  • Potential applications in organic light-emitting diodes, solar cells, and sensors.