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Factors Affecting Solubility04:01

Factors Affecting Solubility

32.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
32.2K
Formation of Complex Ions03:45

Formation of Complex Ions

18.8K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
18.8K
Precipitation of Ions03:11

Precipitation of Ions

25.4K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
25.4K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

4.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.3K
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...
1.3K
Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

5.9K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Multivariate Sulfate-Pillared Metal Azolate Frameworks with Tunable Flexibility for CO2 Capture from C2 Hydrocarbons.

Hanze Wang1, Weixiang Zuo1, Zhe Wang1

  • 1School of Physical Science and Technology, Shanghai Key Laboratory of High-Resolution Electron Microscopy, State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech University, Shanghai, 201210, China.

Angewandte Chemie (International Ed. in English)
|August 22, 2025
PubMed
Summary

Researchers developed flexible metal azolate frameworks (MAFs) using a multivariate strategy for enhanced gas separation. This approach optimizes CO2 capture and purification of ethylene and ethane from gas mixtures.

Keywords:
Alkane purificationCarbon captureDynamic breakthroughMetal–organic frameworkStructural locking

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Metal azolate frameworks (MAFs) are promising porous materials for gas separation.
  • Tuning framework flexibility is crucial for optimizing gas uptake and selectivity.
  • A multivariate (MTV) synthesis strategy offers a pathway to systematically control MAF properties.

Purpose of the Study:

  • To synthesize sulfate-pillared MAFs using an MTV strategy to tune framework flexibility and gas separation performance.
  • To investigate the structure-property relationships governing gas adsorption and separation in these MAFs.
  • To achieve enhanced separation of CO2 from light hydrocarbons, particularly ethylene purification.

Main Methods:

  • MTV synthesis of sulfate-pillared MAFs with varying linker compositions.
  • Gas adsorption experiments (CO2, C2H4, C2H6) to evaluate uptake and selectivity.
  • Breakthrough experiments to assess real-world separation performance.
  • Structural analyses (e.g., X-ray diffraction) and interaction energy calculations.

Main Results:

  • A monotonic sulfate-pillared MAF, Zn2(daTz)2SO4, showed dynamic structural changes for efficient CO2, C2H4, and C2H6 uptake.
  • Incorporating an asymmetric linker locked the framework, enhancing CO2 selectivity over hydrocarbons.
  • The MTV approach enabled precise structural control, leading to superior CO2/C2H6 and CO2/C2H4 separations.
  • A specific MAF composition achieved a 17-fold enhancement in ethylene purification.

Conclusions:

  • The MTV strategy is effective for tuning MAF flexibility and gas separation performance.
  • Structural dynamics and linker modification are key to optimizing CO2 capture and hydrocarbon separations.
  • These findings provide insights for designing advanced porous materials for selective gas separation applications.