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Related Concept Videos

Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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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...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Stability of Conjugated Dienes01:28

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Introduction
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MO Theory and Covalent Bonding02:40

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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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.
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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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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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Related Experiment Video

Updated: Jul 19, 2025

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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Double-Walled Covalent Organic Frameworks with High Stability.

Yu Gong1, Shaofeng Huang1, Zepeng Lei1

  • 1Department of Chemistry, University of Colorado Boulder, Boulder, Colorado, 80309, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 9, 2023
PubMed
Summary
This summary is machine-generated.

Double-walled covalent organic frameworks (DW-COFs) were synthesized, showing enhanced stability and high porosity. These novel materials demonstrate excellent CO2 over N2 selectivity, making them promising for gas storage and separation applications.

Keywords:
adsorptioncarbon dioxide separationcovalent organic frameworksmicroporous materialsstability enhancement

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Double-walled covalent organic frameworks (DW-COFs) offer enhanced stability and functional site density compared to traditional frameworks.
  • Their unique structure can improve resistance to harsh chemical environments and increase suitability for diverse applications.

Purpose of the Study:

  • To synthesize and characterize novel double-walled covalent organic frameworks (DW-COFs).
  • To evaluate the stability, porosity, and gas adsorption properties of the synthesized DW-COFs, particularly for CO2/N2 separation.

Main Methods:

  • Synthesis of DW-COFs (DW-COF-1 and DW-COF-2) via imine condensation.
  • Characterization of structural properties, crystallinity, and stability under various conditions (boiling water, acid, base).
  • Gas adsorption experiments to determine porosity and selectivity for CO2/N2 mixtures.

Main Results:

  • Successful synthesis of DW-COF-1 and DW-COF-2 with honeycomb topology, high crystallinity, and stability.
  • DW-COF-2 demonstrated exceptional resistance to boiling water, strong acids, and bases due to its protective double-walled structure.
  • High porosity (approx. 900 m²/g) was observed for both DW-COFs.
  • Excellent CO2/N2 selectivity was achieved at 273 K and 1 atm, with selectivity values of 121.3 for DW-COF-1 and 56.4 for DW-COF-2.

Conclusions:

  • The synthesized DW-COFs exhibit superior stability and high porosity, suitable for gas storage and separation.
  • The double-walled architecture effectively protects labile imine bonds, enhancing chemical resistance.
  • These DW-COFs show significant potential for selective CO2 capture over N2.