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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
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...
Affinity Chromatography01:03

Affinity Chromatography

Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...

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Related Experiment Video

Updated: Jul 27, 2026

Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol
09:08

Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol

Published on: April 2, 2018

Highly emissive conjugated polymer excimers.

Youngmi Kim1, Jean Bouffard, Steven E Kooi

  • 1Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Journal of the American Chemical Society
|September 30, 2005
PubMed
Summary

New poly(phenylene ethynylene)s with unique ring structures overcome aggregation-caused quenching, yielding highly emissive solid-state materials for advanced devices.

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Last Updated: Jul 27, 2026

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Photophysics

Background:

  • Conjugated polymers often suffer reduced fluorescence efficiency in aggregated states due to interpolymer interactions forming weakly emissive species.
  • These aggregation-induced emission losses limit their application in optoelectronic devices.

Purpose of the Study:

  • To investigate novel poly(phenylene ethynylene)s with fused pendant [2.2.2] ring structures.
  • To understand the origin of highly emissive, red-shifted solid-state emission in these new materials.

Main Methods:

  • Synthesis of poly(phenylene ethynylene)s with specific [2.2.2] ring structures and ester-substituted alkene bridges.
  • Photophysical studies in solution, spin-coated thin films, solid solutions, and Langmuir films.

Main Results:

  • The designed polymers exhibit highly emissive, broad, and red-shifted emission spectra in the solid state.
  • The new emissive species are identified as excimers formed via interchain interactions mediated by the [2.2.2] ring system.

Conclusions:

  • The fused [2.2.2] ring system effectively mediates interchain interactions to produce highly emissive conjugated polymer excimers.
  • This design strategy offers a pathway for tailoring emission properties in conjugated polymers for electroluminescence and sensory applications.