Related Experiment Video
Updated: Apr 9, 2026
08:12
Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
Published on: September 5, 2018
16.7K
Metal-Organic Frameworks (MOFs) as Multivalent Materials: Size Control and Surface Functionalization by Monovalent
Timon Rijnaarts1, Raquel Mejia-Ariza1, Richard J M Egberink1
1Molecular NanoFabrication group, MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede (The Netherlands), Fax: (+31) 53489-4645 http://www.utwente.nl/tnw/mnf/
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 23, 2015
Summary
Researchers controlled metal-organic framework (MOF) particle size and composition using capping ligands. This functionalization enables tuning MOF properties for biomedical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Controlling particle size and composition is crucial for tailoring metal-organic frameworks (MOFs) for specific applications, particularly in biomedicine.
- Metal-organic frameworks (MOFs) offer tunable properties but require precise control over their physical characteristics.
Purpose of the Study:
- To achieve precise control over the particle size and surface functionalization of MIL-88A, a type of MOF.
- To demonstrate the potential of functionalized MIL-88A for biomedical applications.
Main Methods:
- Stoichiometric replacement of fumarate with monovalent capping ligands to control MIL-88A particle size and composition.
- Utilized a fluorine-capping ligand to quantify surface coverage.
- Employed monovalent carboxylic acid-functionalized poly(ethylene glycol) (PEG-COOH) ligands at varying concentrations for nanoscale size control.
- Functionalized MIL-88A with a biotin-carboxylic acid ligand for subsequent biomolecule binding.
Main Results:
- Successfully controlled the particle size of MIL-88A at the nanoscale.
- Quantified surface capping ligand coverage using a fluorine-capping ligand.
- Demonstrated MIL-88A functionalization by successfully binding fluorescently labeled streptavidin via biotin-streptavidin interactions.
Conclusions:
- Monovalent capping ligands effectively control MIL-88A particle size and enable surface functionalization.
- The developed method provides a pathway for tailoring MOFs for advanced applications, including targeted drug delivery and bio-imaging.
- Functionalized MIL-88A shows promise for developing new diagnostic and therapeutic tools in biomedical science.
Related Concept Videos
02:51Metal-Ligand Bonds
25.6K
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...
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...
25.6K
00:43Complexometric Titration: Ligands
2.7K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.7K
01:23Properties of Organometallic Compounds
2.2K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
2.2K
01:19Complexation Equilibria: The Chelate Effect
1.6K
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...
1.6K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
979
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...
979
02:58Crystal Field Theory - Octahedral Complexes
31.9K
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...
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...
31.9K