Related Experiment Video
Updated: Jun 14, 2026
06:53
Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Magnetism in metal-organic capsules
Jerry L Atwood1, Euan K Brechin, Scott J Dalgarno
1Department of Chemistry, University of Missouri, 601 S. College Ave., Columbia, MO 65211, USA. AtwoodJ@missouri.edu
Chemical Communications (Cambridge, England)
|April 2, 2010
Summary
Researchers studied nickel and cobalt metal-organic capsules. Antiferromagnetic exchange was observed in the nickel capsule due to its unique framework structure.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Magnetochemistry
Background:
- Metal-organic frameworks (MOFs) offer tunable structures for diverse applications.
- Encapsulation of metal ions within MOFs presents opportunities for novel magnetic properties.
Purpose of the Study:
- To synthesize and characterize novel nickel and cobalt-containing metal-organic capsules.
- To investigate the magnetic properties and structural features of these encapsulated metal ions.
- To elucidate the origins of magnetic exchange interactions within the capsule framework.
Main Methods:
- Isolation and purification of nickel and cobalt metal-organic capsules.
- Single-crystal X-ray diffraction for structural determination.
- SQUID magnetometry for magnetic property analysis.
- Density Functional Theory (DFT) calculations for computational studies.
Main Results:
- Successful isolation of nickel and cobalt seamed metal-organic capsules.
- Structural analysis revealed specific coordination environments enforced by the capsule framework.
- Magnetic studies indicated antiferromagnetic exchange in the nickel capsule.
- Computational modeling supported the experimental findings regarding magnetic interactions.
Conclusions:
- The metal-organic capsule framework dictates the coordination environment of encapsulated metal ions.
- This enforced coordination is responsible for the observed antiferromagnetic exchange in the nickel capsule.
- These findings contribute to the understanding of magnetic phenomena in confined metal-organic systems.
Related Concept Videos
01:23Properties of Organometallic Compounds
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.
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:30Magnetism
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
01:24Potential Due to a Magnetized Object
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...