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Related Concept Videos

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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 staggered...
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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 tetrahedral value,...
Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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...
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

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 was based on the...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...

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Updated: Jun 23, 2026

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
08:40

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Published on: May 15, 2018

Orientational ordering in solid C60 fullerene-cubane.

Bart Verberck1, Gerard A Vliegenthart, Gerhard Gompper

  • 1Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium. bart.verberck@ua.ac.be

The Journal of Chemical Physics
|April 25, 2009
PubMed
Summary
This summary is machine-generated.

Monte Carlo simulations reveal fullerene-cubane (C(60) x C(8)H(8)) crystal structure changes. The study identifies orientational ordering in C(60) molecules, similar to solid C(60), supporting doubled periodicity.

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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Physics

Background:

  • Fullerene-cubane (C(60) x C(8)H(8)) is a complex material with unique structural properties.
  • Understanding its phase behavior and molecular arrangement is crucial for potential applications.

Purpose of the Study:

  • To investigate the structure and phase transitions of fullerene-cubane using computational methods.
  • To elucidate the orientational ordering of C(60) molecules within the crystal lattice.

Main Methods:

  • Monte Carlo simulations were employed to model the system.
  • A simplified potential model incorporating icosahedral and cubic symmetries was utilized.

Main Results:

  • The simulation successfully reproduced the experimentally observed cubic to orthorhombic phase transition.
  • Rotational freezing of C(60) molecules and a specific orientational ordering pattern were identified.
  • The observed ordering supports a doubled periodicity along a crystal axis.

Conclusions:

  • The study provides insights into the low-temperature structural and orientational properties of fullerene-cubane.
  • The findings contribute to the understanding of molecular ordering in fullerene-based materials.