Related Experiment Video
Updated: Jun 13, 2026
06:53
Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Field induced 4f5d [Re(salen)]2O3[Dy(hfac)3(H2O)]2 single molecule magnet
Fabrice Pointillart1, K Bernot, R Sessoli
1L.A.M.M, Department of Chemistry and INSTM Research Unit, Università di Firenze, Via Della Lastruccia 3, 50019 Sesto Fiorentino, Italy. fabrice.pointillart@univ-rennes1.fr
Inorganic Chemistry
|April 14, 2010
Summary
A new dysprosium-rhenium compound (Dy(2)Re(2)) was synthesized and characterized. This molecule exhibits slow magnetic relaxation, indicating potential for molecular magnetism applications.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Magnetochemistry
Background:
- The synthesis and characterization of novel polynuclear metal complexes are crucial for developing advanced magnetic materials.
- Dysprosium (Dy) and Rhenium (Re) based compounds are of interest due to their unique magnetic and redox properties.
Purpose of the Study:
- To synthesize and characterize a new Dy-Re complex with the formula {[Re(salen)](2)O(3)[Dy(hfac)(3)(H(2)O)](2)}(CHCl(3))(2)(CH(2)Cl(2))(2), denoted as Dy(2)Re(2).
- To investigate the structural, redox, and magnetic properties of the synthesized Dy(2)Re(2) compound.
Main Methods:
- Single crystal and powder X-ray diffraction for structural determination.
- Cyclic voltammetry to assess redox activity.
- Static and dynamic magnetic susceptibility measurements to characterize magnetic behavior.
Main Results:
- The Dy(2)Re(2) compound was found to be isostructural to its Y(III) analog.
- Redox activity was confirmed through cyclic voltammetry.
- Static magnetic data analysis revealed weak ferromagnetic exchange interactions between Dy(III) ions.
- Dynamic magnetic studies showed slow relaxation of magnetization under an external magnetic field, characteristic of single-molecule magnet behavior.
Conclusions:
- The Dy(2)Re(2) complex represents a new addition to the field of polynuclear metal-organic compounds.
- The observed slow magnetic relaxation suggests potential applications in molecular magnetism and data storage.
- Further studies are warranted to optimize the magnetic properties and explore potential applications.
Related Concept Videos
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...
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.
01:31Ferromagnetism
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...
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
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...