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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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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.
Due to the absence of continuous...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.7K
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...
2.7K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Anion-Responsive π-Conjugated Macrocycles That Form Ordered Structures.

Hiroki Horita1, Hiroki Okano1, Yoshihiro Kikkawa2

  • 1Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Kusatsu, 525-8577, Japan.

Chemistry, an Asian Journal
|January 8, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized anion-responsive macrocycles that bind anions and form ordered structures. These macrocycles self-assemble into complex structures, demonstrating unique ion-pairing and charge-by-charge assembly properties.

Keywords:
Anion bindingCharge-by-charge assembliesIon pairingPyrrole derivativesπ-Electronic systems

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Anion recognition is crucial in chemical sensing and biological processes.
  • π-conjugated macrocycles offer unique electronic and structural properties for molecular assembly.
  • Controlling self-assembly through external stimuli like anions is a key challenge in materials design.

Purpose of the Study:

  • To synthesize novel anion-responsive π-conjugated macrocycles.
  • To investigate the anion-binding and ion-pairing capabilities of these macrocycles.
  • To explore the formation of ordered and disordered supramolecular structures driven by anion interactions.

Main Methods:

  • Synthesis of anion-responsive π-conjugated macrocycles.
  • Single-crystal X-ray diffraction analysis to elucidate complex structures.
  • Scanning tunneling microscopy (STM) to observe surface-assembled macrocycle arrays on highly oriented pyrolytic graphite (HOPG).

Main Results:

  • Demonstrated anion-binding and ion-pairing properties of the synthesized macrocycles.
  • Revealed ion-pairing charge-by-charge assembly in a [1+2]-type complex via X-ray crystallography.
  • Observed anion-driven formation of two-dimensional (2D) disordered arrays of macrocycles on HOPG using STM.

Conclusions:

  • The synthesized macrocycles effectively bind anions and participate in ion-pairing.
  • Charge-by-charge assembly leads to ordered supramolecular structures.
  • Anion-induced structural changes can be utilized to create functional 2D materials.