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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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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.
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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...
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Parameterizing and grading hydrolytic stability in metal-organic frameworks.

Benjamin S Gelfand1, George K H Shimizu1

  • 1Department Of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada. gshimizu@ucalgary.ca.

Dalton Transactions (Cambridge, England : 2003)
|December 10, 2015
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Summary
This summary is machine-generated.

This report establishes benchmarks for assessing the hydrolytic stability of metal-organic frameworks (MOFs). It aims to standardize the discussion of MOF water stability for broader applications.

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) are porous materials with diverse applications.
  • Hydrolytic instability is a major limitation for large-scale MOF utilization.
  • Data on MOF water stability, especially negative results, is often unpublished.

Purpose of the Study:

  • To propose common benchmarks for evaluating MOF hydrolytic stability.
  • To standardize definitions for MOF water exposure and assessment methods.
  • To facilitate consistent scientific discussion on MOF water stability.

Main Methods:

  • Reviewing existing literature on MOF water stability.
  • Defining criteria for MOF exposure to moisture.
  • Establishing methods for assessing MOF integrity post-exposure.

Main Results:

  • Lack of standardized methods hinders consistent reporting of MOF stability.
  • Proposed definitions for exposure and assessment aim to improve comparability.
  • Focus is on establishing a framework, not ranking existing MOFs.

Conclusions:

  • Standardized benchmarks are crucial for advancing MOF research and application.
  • Consistent reporting of hydrolytic stability will accelerate material development.
  • This work promotes a unified approach to understanding MOF water resistance.