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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,...
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

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Related Experiment Video

Updated: May 25, 2026

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

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Published on: May 15, 2018

Incorporating C2 into C60 films.

Seyithan Ulas1, Dmitry Strelnikov, Patrick Weis

  • 1Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Karlsruhe, Baden-Württemberg, Germany.

The Journal of Chemical Physics
|January 14, 2012
PubMed
Summary
This summary is machine-generated.

Depositing carbon (C(2)(-)) anions onto fullerene (C(60)) films creates a new, stable carbon material. This material decomposes differently than pure C(60) films, forming fused fullerene cages.

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Fullerenes (C(60)) are carbon allotropes with unique electronic properties.
  • Understanding fullerene modifications is key to developing novel carbon materials.

Purpose of the Study:

  • To investigate the properties of carbon (C(2)(-)) anion deposition onto fullerene (C(60)) films.
  • To characterize the resulting material and its thermal behavior.

Main Methods:

  • Thermal desorption mass spectroscopy
  • Ultraviolet photoionization spectroscopy
  • Atomic force microscopy (AFM)
  • Surface-enhanced Raman spectroscopy
  • Density Functional Theory (DFT) calculations

Main Results:

  • C(2)(-)/C(60) films exhibit distinct thermal desorption behavior compared to pure C(60).
  • Decomposition yields a high-temperature-stable material and desorbed fullerenes (C(60), C(62), C(64)).
  • As-prepared films contain polymeric networks; annealing leads to fused fullerene cages.

Conclusions:

  • C(2)(-) deposition significantly alters fullerene electronic and vibrational properties.
  • Thermal decomposition involves C(2) unit incorporation into fullerene cages.
  • A novel carbonaceous material with fused fullerene cages and a finite density of states at the Fermi level is formed.