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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

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Thermal Scanning Conductometry (TSC) as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
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Anion-responsive supramolecular gels.

Hiromitsu Maeda1

  • 1College of Pharmaceutical Sciences, Institute of Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, Japan. maedahir@ph.ritsumei.ac.jp

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 1, 2008
PubMed
Summary
This summary is machine-generated.

Anion-responsive supramolecular gels offer controlled structural changes. This study explores amide-, urea-, and metal-coordinated systems, plus novel oligopyrroles, for anion-modulated gel properties.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Chemical engineering

Background:

  • Anion-responsive supramolecular gels exhibit stimuli-responsive behavior.
  • Few examples exist of gels with anion-controlled structures and properties.
  • Designing gelators requires specific interaction units like aliphatic chains, pi planes, and hydrogen-bonding sites.

Purpose of the Study:

  • To explore the gelation and transition behaviors of anion-responsive supramolecular systems.
  • To investigate amide- and urea-based systems, metal-coordinated systems, and novel acyclic pi-conjugated oligopyrroles.
  • To demonstrate the potential of these systems for dimensionally-controlled organized structures.

Main Methods:

  • Synthesis of low-molecular-weight gelators with specific functional groups.
  • Characterization of gelation and transition behaviors in response to anions.
  • Utilizing van der Waals interactions, pi-stacking, hydrogen bonding, and metal coordination for anion recognition.

Main Results:

  • Demonstrated anion-modulated gelation and structural transitions in various systems.
  • Identified amide- and urea-based compounds as effective gelators.
  • Showcased novel acyclic pi-conjugated oligopyrroles as "molecular flippers" for precise control.

Conclusions:

  • Amide- and urea-based systems, along with metal-coordinated and oligopyrrole structures, are promising for anion-responsive supramolecular gels.
  • These materials offer tunable properties for applications requiring anion-controlled organization.
  • Further research into these systems can lead to advanced functional materials.