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Related Concept Videos

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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VSEPR Theory for Determination of Electron Pair Geometries
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
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.
CFT focuses on...
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Alkyl Halides02:45

Alkyl Halides

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Structural Properties
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Highly Conjugated Two-dimensional Covalent Organic Frameworks for Efficient Iodine Uptake.

Mingan Zhou1, Zhongping Li2, Alexis Munyentwali3,4,5

  • 1School of Chemistry & Chemical Engineering, Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization, Anhui University of Technology, 243002, Ma'anshan, P. R. China.

Chemistry, an Asian Journal
|May 24, 2022
PubMed
Summary

New covalent organic frameworks (COFs) efficiently capture radioactive iodine from nuclear waste. TFPB-PyTTA-COF shows superior iodine uptake, offering a promising solution for environmental safety.

Keywords:
covalent organic frameworkhigh capacityiodinesorptionstability

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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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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter

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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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Published on: July 13, 2018

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nuclear Engineering

Background:

  • Radioactive iodine poses significant risks to ecosystems and human health.
  • Effective adsorbents for iodine capture are crucial for nuclear waste management.
  • Current adsorbent technologies face challenges in achieving high efficiency and stability.

Purpose of the Study:

  • To design and synthesize novel covalent organic frameworks (COFs) for efficient radioactive iodine capture.
  • To evaluate the iodine adsorption performance of the newly developed COFs.
  • To investigate the structural properties influencing adsorption capacity.

Main Methods:

  • Synthesis of two highly conjugated 2D COFs: TFPB-BPTA-COF and TFPB-PyTTA-COF.
  • Characterization of COF porosity, stability, and π-conjugated framework.
  • Quantification of iodine uptake capacity for each COF.

Main Results:

  • Successful construction of TFPB-BPTA-COF and TFPB-PyTTA-COF with high porosity and stability.
  • TFPB-PyTTA-COF demonstrated exceptional iodine uptake capacity, reaching 5.6 g/g.
  • The high π-conjugated framework of the COFs is key to their adsorption performance.

Conclusions:

  • The developed COFs, particularly TFPB-PyTTA-COF, represent a significant advancement in iodine capture technology.
  • These materials offer a highly efficient and stable solution for mitigating radioactive iodine contamination.
  • The findings pave the way for improved nuclear waste treatment strategies.