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Related Concept Videos

Carbon Skeletons01:12

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
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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,...
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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.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Long-range ordered porous carbons produced from C60.

Fei Pan1, Kun Ni1, Tao Xu2

  • 1Department of Materials Science and Engineering, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China.

Nature
|January 11, 2023
PubMed
Summary

Researchers developed gram-scale long-range ordered porous carbon (LOPC) from C60 powder using a novel catalytic method. This new carbon material, LOPC, opens doors for discovering other crystalline carbon structures.

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Area of Science:

  • Materials Science
  • Chemistry
  • Condensed Matter Physics

Background:

  • Previous methods for creating covalently bonded carbon structures from C60 molecules yielded minimal sample quantities.
  • Limited sample sizes hindered detailed characterization and exploration of C60-based materials for applications.

Purpose of the Study:

  • To report a scalable method for preparing a novel carbon material from C60.
  • To characterize the structure, properties, and formation mechanism of the new material.

Main Methods:

  • Gram-scale synthesis of long-range ordered porous carbon (LOPC) from C60 powder catalyzed by alpha-lithium nitride (α-Li3N) at ambient pressure.
  • Characterization using X-ray diffraction, Raman spectroscopy, solid-state NMR, transmission electron microscopy, and neutron scattering.
  • Numerical simulations employing a neural network to understand the material's formation pathway.

Main Results:

  • Successful gram-scale preparation of LOPC, a material composed of connected, broken C60 cages with long-range periodicity.
  • LOPC identified as a metastable structure formed during the fullerene-to-graphene transition, distinct from polymerized C60 crystals.
  • LOPC exhibits higher electron delocalization and a room temperature electrical conductivity of 1.17 × 10^-2 S cm^-1.

Conclusions:

  • The development of a scalable LOPC synthesis method overcomes previous limitations in sample availability.
  • LOPC represents a new class of crystalline carbon materials derived from fullerenes.
  • This work facilitates the discovery of other novel crystalline carbon structures.