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Related Concept Videos

Ion Exchange01:17

Ion Exchange

680
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...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
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,...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.6K
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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.6K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Pseudo Polyampholytes with Sensitively Ion-Responsive Conformational Transition Based on Positively Charged

Hai-Yue Qin1, Zhuang Liu1,2, Xue-Dan Yang1

  • 1School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.

Macromolecular Rapid Communications
|March 25, 2022
PubMed
Summary

Synthetic polyampholytes mimic biological functions by undergoing environmentally triggered conformational changes. These novel materials offer potential applications as molecular transporters and biocatalysts in artificial systems.

Keywords:
crown ethershost-guest complexesion-recognitionphase transitionpolymeric ampholytes

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Biological polyampholytes are crucial for cellular transport and function.
  • Synthetic amphoteric macromolecules are of interest for mimicking natural polyampholyte properties.
  • Developing synthetic analogs that respond to environmental stimuli is a key research area.

Purpose of the Study:

  • To explore synthetic pseudo polymeric ampholytes with ion-recognition-triggered conformational changes.
  • To investigate the phase transition behaviors of these novel polyampholytes.
  • To establish structure-property relationships for ion-responsive polymer design.

Main Methods:

  • Synthesis of pseudo polyampholytes containing carboxylic acid groups and 18-crown-6 units.
  • Systematic investigation of phase transition behaviors under varying cation species and concentrations.
  • Analysis of ion-recognition mechanisms and host-guest complex formation.

Main Results:

  • Phase transitions are triggered by specific cations (K+, Ba2+, Sr2+, Pb2+) forming 1:1 complexes with 18-crown-6.
  • Conformational changes are controlled by cation type and concentration, mimicking pH-dependent polyampholytes.
  • Tuning carboxylic acid group content enhances sensitivity to recognizable cations.

Conclusions:

  • Synthetic pseudo polyampholytes exhibit ion-recognition-triggered amphoteric characteristics.
  • These materials can function as molecular transporters, genetic code storage, and biocatalysts in artificial systems.
  • The study provides a pathway for designing advanced functional polymers inspired by biological systems.