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Related Concept Videos

Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
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Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.

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Related Experiment Video

Updated: May 18, 2026

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
12:51

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Published on: November 14, 2015

Redox-responsive reverse vesicles self-assembled by pseudo[2]rotaxanes for tunable dye release.

Kang-Da Zhang1, Tian-You Zhou, Xin Zhao

  • 1Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 10, 2012
PubMed
Summary

Researchers created functional reverse vesicles using self-assembling TTF/CBPQT(4+)-based pseudorotaxanes. These redox-responsive vesicles enable tunable, sustained dye release by exploiting their dynamic dissociation properties.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Self-assembly is a key strategy for constructing complex molecular architectures.
  • Vesicles are crucial nanoscale containers with diverse applications.
  • Stimuli-responsive materials are highly sought after for advanced applications.

Purpose of the Study:

  • To construct novel reverse vesicles with functions mimicking natural ones.
  • To investigate the redox-responsive behavior of these self-assembled structures.
  • To demonstrate controlled release of encapsulated substances.

Main Methods:

  • Utilized TTF/CBPQT(4+)-based pseudo[2]rotaxanes for self-assembly in a nonpolar solvent.
  • Incorporated Fréchet-type G-3 dendron and hydrogen-bonded arylamide foldamer at the ends of the rotaxane threads.
  • Studied the redox response and dissociation dynamics of the constructed vesicles.

Main Results:

  • Successfully constructed reverse vesicles via self-assembly of pseudo[2]rotaxanes.
  • Demonstrated redox-responsive behavior of the engineered vesicles.
  • Achieved sustained release of embedded dyes, tunable by solvent polarity, due to dynamic pseudorotaxane dissociation.

Conclusions:

  • The TTF/CBPQT(4+)-based pseudo[2]rotaxanes self-assemble into functional reverse vesicles.
  • These vesicles exhibit redox responsiveness and controlled release capabilities.
  • The dynamic nature of the pseudorotaxanes allows for tunable cargo release, opening avenues for smart materials.