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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...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
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Coordination chemistry and antisolvent strategy to rare-earth solid solution colloidal spheres.

Cheng Chao Li1, Hua Chun Zeng

  • 1Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.

Journal of the American Chemical Society
|October 25, 2012
PubMed
Summary

Researchers developed a new method to create rare-earth coordination polymer colloidal spheres (RE-CPCSs). This technique allows for precise control over composition and structure, enabling new applications.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Nanotechnology

Background:

  • Rare-earth coordination polymers (RE-CPs) are challenging to synthesize in controlled forms.
  • Existing methods struggle to achieve homogeneous mixing of multiple rare-earth elements in colloidal spheres.
  • Developing versatile synthetic routes for functional nanomaterials is crucial for advanced applications.

Purpose of the Study:

  • To establish a general synthetic strategy for preparing single- and multicomponent rare-earth coordination polymer colloidal spheres (RE-CPCSs).
  • To achieve highly monodisperse RE-CPCSs with homogeneous mixing of rare-earth elements, overcoming limitations of current methods.
  • To demonstrate the tunability of RE-CPCSs' composition, structure, and properties for diverse applications.

Main Methods:

  • Integration of coordination chemistry with the antisolvent effect for synchronized precipitation.
  • Controlled addition of precursor salts to adjust the type and molar ratio of RE-CPCSs.
  • Utilizing differential coordination chemistry and precipitation behavior for core/shell structure formation.

Main Results:

  • Successfully prepared highly monodisperse RE-CPCSs with homogeneous mixing of rare-earth elements for the first time.
  • Demonstrated a linear relationship between the molar ratio of RE elements in the spheres and the precursor salts.
  • Achieved facile synthesis of RE-based core/shell colloidal spheres and tunable luminescent properties by adjusting ionic activators.
  • Transformed RE-CPCSs into monodisperse lanthanide oxide spheres via heat treatment.

Conclusions:

  • The developed synthetic strategy offers a viable route for preparing various lanthanide-containing colloidal spheres.
  • The RE-CPCSs exhibit significant potential for applications in optoelectronic devices, catalysts, gas sensors, and solar cells.
  • This method provides a scalable and adaptable approach for designing advanced functional nanomaterials.