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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...
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sp3d and sp3d 2 Hybridization
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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, respectively.
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

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 an...
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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 overlap of p...

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Through-space pi-delocalized Pillar[5]arene.

Tomoki Ogoshi1, Kenji Umeda, Tada-aki Yamagishi

  • 1Department of Chemistry and Chemical Engineering, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan. ogoshi@t.kanazawa-u.ac.jp

Chemical Communications (Cambridge, England)
|August 5, 2009
PubMed
Summary
This summary is machine-generated.

A novel pillar[5]arene with phenylethynyl groups was synthesized. This material exhibits responsive blue-green emission influenced by temperature and solvent changes due to pi-delocalization within its cavity.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Pillararenes are macrocyclic compounds known for their unique host-guest properties.
  • Modifying pillararene structures can tune their photophysical properties.

Purpose of the Study:

  • To synthesize a novel pillar[5]arene derivative with phenylethynyl substituents.
  • To investigate the photoluminescent properties and responsiveness of the synthesized pillararene.

Main Methods:

  • Synthesis of pillar[5]arene via modification of phenylethynyl groups.
  • Spectroscopic analysis (UV-Vis absorption, fluorescence emission) to study photophysical properties.
  • Variable temperature and solvent studies to assess emission responsiveness.

Main Results:

  • Successful preparation of the pillar[5]arene with modified phenylethynyl groups.
  • Observed blue-green emission from the synthesized compound.
  • Demonstrated temperature- and solvent-responsive luminescence attributed to through-space pi-delocalization within the macrocyclic cavity.

Conclusions:

  • The synthesized pillar[5]arene exhibits tunable photoluminescence.
  • The material's responsiveness to external stimuli opens possibilities for sensor applications.
  • Through-space pi-delocalization is a key factor in the observed responsive emission.