Related Experiment Video
Updated: Jun 3, 2026
06:53
Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Molecular magnetic materials based on 4d and 5d transition metals
Xin-Yi Wang1, Carolina Avendaño, Kim R Dunbar
1Department of Chemistry, Texas A&M University, College Station, TX 77840, USA.
Chemical Society Reviews
|March 17, 2011
Summary
Paramagnetic compounds featuring 4d and 5d transition metals are gaining attention in molecular magnetism. Heavier metal ions offer unique properties like enhanced magnetic anisotropy and diverse redox behavior, driving new material development.
Area of Science:
- Molecular Magnetism
- Coordination Chemistry
- Materials Science
Background:
- Emerging research focuses on paramagnetic compounds utilizing 4d and 5d transition metals.
- Heavier transition metal ions impart unique physical properties to paramagnetic compounds.
- Key attributes include diffuse d orbitals, strong magnetic anisotropy (spin-orbit coupling), and varied structural/redox characteristics.
Purpose of the Study:
- To introduce readers to the burgeoning field of second and third row transition metal molecular magnetism.
- To review recent advancements and the current status of research in this area.
- To highlight the distinctive role of heavier transition metal ions through specific examples.
Main Methods:
- Critical review synthesizing existing research on 4d and 5d transition metal magnetism.
- Survey of historical development and current research trends.
- Organization of findings based on precursor building blocks and illustrative case studies.
Main Results:
- Detailed exploration of the unique magnetic properties conferred by heavier transition metals.
- Discussion of how diffuse d orbitals and enhanced spin-orbit coupling influence magnetic behavior.
- Presentation of diverse structural and redox properties achievable with these metal ions.
Conclusions:
- Second and third row transition metals are crucial for advancing molecular magnetism.
- Their unique electronic and structural properties enable the design of novel magnetic materials.
- The review provides a foundational understanding for researchers in molecular magnetism and coordination chemistry-based materials synthesis.
More Related Videos
Related Concept Videos
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.
02:58Properties of Transition Metals
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.
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...
01:26Diamagnetism
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
02:58Crystal Field Theory - Octahedral Complexes
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...