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Structural Isomerism02:34

Structural Isomerism

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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.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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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.
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations
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Dynamic Metal-Organic Tube Isomers.

Linkui Wang1,2, Qihui Chen1, Xiaopeng Li3

  • 1State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.

Angewandte Chemie (International Ed. in English)
|December 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed dynamic metal-organic tubes that transform in multiple ways due to various stimuli. These responsive materials can control guest molecules for applications like enhanced fluorescence and white light emission.

Keywords:
IsomerizationLuminescenceMetal‐organic assembliesMulti‐stimuli responsivityRadicals

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Achieving multi-stimuli-responsive and multi-level transformations in artificial assemblies is a significant challenge.
  • Dynamic coordination chemistry offers pathways to create responsive molecular architectures.

Purpose of the Study:

  • To design and synthesize dynamic metal-organic tubes capable of undergoing multi-level transformations.
  • To investigate the stimuli-responsive behavior of these tubes towards physical factors, neutral guests, and anionic templates.
  • To explore the application of these dynamic tubes in controlling guest molecule behavior.

Main Methods:

  • Synthesis of dynamic metal-organic tubes from a ligand with multiple coordination modes and flexible conformations.
  • Investigation of stimuli-responsive transformations including conformational isomerization, adaptive deformation, and adaptive reconstruction.
  • Characterization of the dynamic tube's response to physical factors (concentration, temperature, polarity), neutral guests, and anionic templates (PF6-).
  • Utilizing dimethyl sulfoxide (DMSO) as both a physical factor and a chemical template.

Main Results:

  • A pair of dynamic metal-organic tube isomers was successfully prepared.
  • The tubes exhibited multi-level transformations in response to diverse stimuli.
  • Guest-driven deformations were followed by template-induced reconstruction.
  • DMSO demonstrated dual functionality, regulating both isomerization and reconstruction.
  • Controlled regulation of encapsulated 1-formylpyrene and 1-acetylpyrene stacking modes was achieved.
  • Stable guest radicals were generated, guest fluorescence was enhanced, and white light emission was realized.

Conclusions:

  • The synthesized dynamic metal-organic tubes represent a novel artificial assembly with multi-stimuli-responsive and multi-level transformation capabilities.
  • These dynamic tubes offer a versatile platform for precise control over molecular interactions and functions.
  • The findings open avenues for developing advanced materials for sensing, light emission, and molecular recognition.