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Ion Exchange01:17

Ion Exchange

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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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Extraction: Advanced Methods00:56

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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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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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.
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...
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Formation of Complex Ions03:45

Formation of Complex Ions

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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...
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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Related Experiment Video

Updated: Apr 30, 2026

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

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Solvent-dependent cation exchange in metal-organic frameworks.

Carl K Brozek1, Luca Bellarosa, Tomohiro Soejima

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (USA).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 1, 2014
PubMed
Summary

Solvent choice critically impacts cation exchange in metal-organic frameworks (MOFs). Understanding these solvent effects provides a new method for optimizing cation insertion in MOFs and similar materials.

Keywords:
cation exchangeligand field parametersmetal-organic frameworkspolarity indexsolvation energy

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) are porous materials with tunable properties.
  • Cation exchange is a key process for modifying MOF functionality.
  • Understanding factors controlling cation exchange is crucial for MOF applications.

Purpose of the Study:

  • To investigate the influence of various solvents on cation exchange in MOFs.
  • To identify critical solvent parameters governing cation insertion.
  • To establish a generalizable method for studying cation exchange in MOFs.

Main Methods:

  • Studied the effect of different solvents on Ni(2+) insertion into MOF-5.
  • Investigated Co(2+) insertion into MFU-4l using various solvents.
  • Correlated cation insertion extent with solvent properties.

Main Results:

  • Identified specific solvent parameters that promote or inhibit cation exchange.
  • Observed distinct trends in cation insertion based on solvent properties for both MOF systems.
  • Demonstrated a correlation between solvent characteristics and the efficiency of cation exchange.

Conclusions:

  • Solvent properties are critical determinants of cation exchange efficiency in MOFs.
  • The findings offer a predictive approach for selecting optimal solvents for cation exchange.
  • This methodology can be applied to various MOFs and other porous materials for tailored modifications.