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Metal-Ligand Bonds02:51

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Crystal Field Theory
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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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Research Progress in Donor-Acceptor Type Covalent Organic Frameworks.

Yeqing Xia1, Weifeng Zhang2,3, Shuai Yang2,3

  • 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|April 24, 2023
PubMed
Summary
This summary is machine-generated.

Donor-acceptor (D-A) type covalent organic frameworks (COFs) enhance charge separation for improved performance. This review details D-A COF synthesis and applications in catalysis, therapy, and electronics.

Keywords:
chemical catalysiscovalent organic frameworksdonor−acceptor structureselectronic devicesphotothermal therapy

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) are porous materials with tunable properties.
  • Intrinsic COFs suffer from rapid electron-hole recombination, limiting their applications.
  • Donor-acceptor (D-A) architectures offer a solution by separating charge carriers.

Purpose of the Study:

  • To review synthetic strategies for D-A type COFs.
  • To summarize the applications of D-A type COFs.
  • To discuss challenges and future directions in D-A COF research.

Main Methods:

  • Introduction of donor (D) and acceptor (A) units into COF backbones.
  • Rational design of linkages and functionalization approaches for D-A COFs.
  • Systematic review of D-A COF applications.

Main Results:

  • D-A COFs exhibit improved charge separation and carrier lifetimes.
  • Successful applications demonstrated in catalysis, photothermal therapy, and electronic materials.
  • Advanced synthetic strategies enable tailored D-A COF properties.

Conclusions:

  • D-A type COFs represent a significant advancement over intrinsic COFs.
  • Further research into synthesis and applications holds great promise.
  • Addressing current challenges will unlock the full potential of D-A COFs.