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Related Concept Videos

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Tetrahedral Complexes
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Updated: Jul 8, 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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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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Crystalline Polyphenylene Covalent Organic Frameworks.

Xing Han1,2, Zihui Zhou1,2, Kaiyu Wang1,2

  • 1Department of Chemistry and Kavli Energy Nanoscience Institute, University of California, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|December 18, 2023
PubMed
Summary
This summary is machine-generated.

New porous polyphenylene covalent organic frameworks (COFs) were synthesized and found to be chemically stable. These materials exhibit promising carbon dioxide uptake capabilities from air and flue gas.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) are crystalline porous polymers with tunable properties.
  • Developing robust COFs for environmental applications like carbon capture is a key research area.

Purpose of the Study:

  • To synthesize novel crystalline polyphenylene COFs using fluorinated building units.
  • To investigate the structural, chemical stability, and CO2 capture properties of the synthesized COFs.

Main Methods:

  • Synthesis via aldol cyclotrimerization of fluorinated tris(4-acetylphenyl)benzene.
  • Structural characterization using powder X-ray diffraction, FTIR, and solid-state 13C CP/MAS NMR spectroscopy.
  • Assessment of chemical stability in harsh conditions and CO2 uptake studies on postsynthetically modified COFs.

Main Results:

  • Two crystalline polyphenylene COFs were successfully synthesized.
  • The COFs demonstrated high porosity and excellent chemical stability in corrosive environments for over a week.
  • Postsynthetically modified COFs showed significant CO2 uptake from ambient air and flue gas.

Conclusions:

  • The synthesized polyphenylene COFs are robust and stable materials.
  • These COFs represent promising candidates for carbon capture technologies.
  • Aldol cyclotrimerization is an effective method for creating stable COF structures.