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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

848
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
848
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.5K
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.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.2K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.5K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.5K
Valence Bond Theory02:42

Valence Bond Theory

8.3K
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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Related Experiment Video

Updated: May 11, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Heterocycle-based dynamic covalent chemistry for dynamic functional materials.

Zeyu Ma1, Siyu Pan1, Yang Yang2

  • 1The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.

Nature Communications
|April 17, 2025
PubMed
Summary
This summary is machine-generated.

Heterocycle-based dynamic covalent chemistry creates reusable, degradable polymers with added UV-blocking and tunable light-emitting functions. This approach advances functional materials beyond traditional dynamic covalent chemistry for sustainability.

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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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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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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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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Dynamic covalent chemistry (DCC) offers reusable and degradable thermoset polymers, crucial for addressing plastic pollution.
  • Current DCC methods primarily focus on network construction, limiting the integration of additional functionalities into polymers.
  • Developing dynamic functional materials remains a challenge due to the limited functional scope of existing DCC strategies.

Purpose of the Study:

  • To introduce heterocycle-based dynamic covalent chemistry for creating advanced functional polymers.
  • To demonstrate the reversibility of aza-Michael addition reactions involving functional heterocycles.
  • To expand the capabilities of DCC beyond recyclability and self-healing to include optical properties.

Main Methods:

  • Developed a novel heterocycle-based dynamic covalent chemistry using dihydropyrimidin-2(1H)-thione and electron-deficient olefins.
  • Investigated the aza-Michael addition reaction for polymer network formation and modification.
  • Characterized the resulting polymers for degradability, recyclability, self-healing, UV-blocking, and luminescence properties.

Main Results:

  • Successfully synthesized degradable linear polymers and recyclable, self-healable crosslinked polymers.
  • Incorporated heterocycles into the polymer backbone, imparting excellent ultraviolet and high-energy blue light-blocking capabilities.
  • Achieved tunable fluorescence and phosphorescence properties within the dynamic polymer networks.

Conclusions:

  • Heterocycle-based dynamic covalent chemistry provides a versatile platform for creating functional polymers with enhanced properties.
  • This approach overcomes limitations of traditional DCC by integrating optical functionalities alongside recyclability and degradability.
  • The study opens new avenues for designing advanced dynamic functional materials with applications in sustainable technologies.