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Related Concept Videos

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.5K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.5K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

12.6K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
12.6K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
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...
2.8K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.3K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.3K
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

11.8K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
11.8K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.5K

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Updated: Jun 19, 2025

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
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Theoretical Insight into Complexation Between Cyclocarbons and C60 Fullerene.

Zeyu Liu1, Tian Lu2

  • 1School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212100, People's Republic of China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 25, 2024
PubMed
Summary
This summary is machine-generated.

Cyclocarbons strongly bind with C60 fullerene, forming stable complexes. These cyclocarbon-fullerene complexes show potential as "molecular glue" for fullerene dimerization.

Keywords:
CyclocarbonsFullerenesInteraction energyNon-covalent interactionsπ-π stacking

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Fullerenes, particularly C60, are extensively studied for their unique electronic and structural properties.
  • Non-covalent interactions are crucial for self-assembly and the formation of complex molecular architectures.
  • Understanding host-guest complexation is vital for designing novel materials and nanoscale systems.

Purpose of the Study:

  • To theoretically investigate the non-covalent complexation between cyclocarbons and C60 fullerene.
  • To determine the binding affinities and structural characteristics of these complexes.
  • To explore the potential of cyclocarbons as 'molecular glue' for fullerene dimerization.

Main Methods:

  • Comprehensive theoretical calculations were employed to study cyclocarbon-C60 fullerene interactions.
  • Analysis of binding energies, structural geometries, and intermolecular forces.
  • Simulation of complex formation under gas phase and solvent conditions.

Main Results:

  • Cyclocarbons exhibit significantly stronger binding with C60 fullerene compared to self-complexation of C18 or C60.
  • Spontaneous assembly into complexes occurs at room temperature, enhanced by hydrophobic effects.
  • Binding strength increases with cyclocarbon size, forming structures like nano-Saturn and dumbbell shapes; cyclocarbons act as effective molecular glues.

Conclusions:

  • Cyclocarbons demonstrate a strong affinity for C60 fullerene, facilitating stable complex formation.
  • The size of the cyclocarbon plays a critical role in the binding strength and resulting complex geometry.
  • Cyclocarbons show promise as versatile building blocks for constructing fullerene-based supramolecular assemblies.