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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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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).
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Structure of Benzene: Kekulé Model01:07

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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.
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Globular and Fibrous Proteins02:21

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Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
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Overview of VSEPR Theory
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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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.
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Twists and Loops: Exploring Lemniscular Vinylogous Benzioctaphyrin(2.0.1.0.2.0.1.0).

Rampal Vishwakarma1, Narayan Ch Jana1, Mainak Das2

  • 1School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, 752050, Odisha, India.

Chemistry, an Asian Journal
|February 5, 2025
PubMed
Summary

This study explores lemniscate-shaped benzioctaphyrins, revealing how structural modifications impact topology and π-electron delocalization. The research introduces the first oligomeric vinylene group in this framework, advancing unique porphyrinoid systems.

Keywords:
BenzioctaphyrinLemniscateMacrocycleTopologyVinylogous

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Octaphyrins enable complex molecular designs with unique properties.
  • Lemniscate-shaped benzioctaphyrins are underexplored, limiting understanding of their behavior.
  • Unconventional macrocyclic geometries offer potential for novel functionalities.

Purpose of the Study:

  • To design, synthesize, and characterize a novel lemniscate-shaped benzioctaphyrin.
  • To investigate the influence of a bis-E-stilbene unit on macrocyclic topology and properties.
  • To explore the impact of structural modifications on π-conjugation and aromaticity.

Main Methods:

  • Incorporation of a bis-E-stilbene unit with a vinylene π-bridge.
  • Synthesis and structural analysis of the benzioctaphyrin(2.0.1.0.2.0.1.0) macrocycle.
  • Protonation studies to induce conformational changes and assess electronic properties.

Main Results:

  • The benzioctaphyrin(2.0.1.0.2.0.1.0) adopts a lemniscate topology to relieve steric strain.
  • Protonation leads to conformational desymmetrization of the macrocycle.
  • A meta-phenylene unit disrupts global π-conjugation, resulting in a nonaromatic system.
  • This work is the first to incorporate an oligomeric vinylene group in a benzioctaphyrin.

Conclusions:

  • Structural modifications significantly influence the topology, π-electron delocalization, and flexibility of benzioctaphyrins.
  • The lemniscate benzioctaphyrin framework offers a platform for developing topologically unique porphyrinoid systems.
  • This research provides foundational insights for future design of advanced macrocyclic compounds.