Related Experiment Video
Updated: Jul 5, 2025
04:51
Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
Published on: June 23, 2023
2.9K
Stability of Zr-Based UiO-66 Metal-Organic Frameworks in Basic Solutions
Jun Yeong Kim1, Jiwon Kang1, Seungheon Cha1
1Department of Chemistry, Chungbuk National University, Cheongju 28644, Republic of Korea.
Nanomaterials (Basel, Switzerland)
|January 11, 2024
Summary
Zr-based metal-organic frameworks (MOFs) degrade in basic solutions. Their stability depends on base strength and concentration, impacting applications in alkaline environments.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Zr-based metal-organic frameworks (MOFs), specifically UiO-66, are known for stability in moisture and acid.
- However, their vulnerability to bases limits their application scope.
- Understanding this instability is crucial for developing robust MOF materials.
Purpose of the Study:
- To systematically investigate the stability of Zr-based UiO-66 MOFs in various basic solutions.
- To determine the influence of different bases (inorganic and organic) on MOF framework integrity.
- To establish a correlation between base properties (strength, concentration) and MOF degradation.
Main Methods:
- Exposure of UiO-66 MOFs to 11 different standard bases.
- Analysis of framework destruction using powder X-ray diffraction (PXRD).
- Quantification of ligand dissolution via nuclear magnetic resonance (NMR) spectroscopy.
Main Results:
- Zr-based UiO-66 MOFs exhibit susceptibility to nucleophilic attack by bases.
- Framework destruction correlates directly with base strength and concentration.
- Ligand dissolution from the MOF structure was successfully monitored.
Conclusions:
- The study quantifies the degradation of Zr-based UiO-66 MOFs under basic conditions.
- Findings provide critical data for predicting and managing MOF stability in alkaline environments.
- This research informs the practical application and design of MOFs for basic settings.
More Related Videos
Related Concept Videos
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
372
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...
372
00:56Extraction: Advanced Methods
447
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...
447
02:54Ions as Acids and Bases
23.7K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
23.7K
02:58Properties of Transition Metals
25.9K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
25.9K