Related Experiment Video
Updated: Jul 25, 2025
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Dipotassiumtetrachloride-bridged dysprosium metallocenes: a single-molecule magnet
Selvakumar Arumugam1, Björn Schwarz2, Prathap Ravichandran1
1Department of Chemistry, Indian Institute of Technology Madras, Chennai, India. csdkartik@iitm.ac.in.
This study details the dynamic magnetic properties of a novel Dy(III) complex, revealing slow magnetization relaxation below 14.5 K due to specific energy levels and a reduced anisotropy barrier.
Area of Science:
- Coordination Chemistry
- Magnetochemistry
- Materials Science
Background:
- Lanthanide complexes are investigated for single-molecule magnet behavior.
- Understanding magnetic relaxation dynamics is crucial for developing molecular magnetic materials.
Purpose of the Study:
- To synthesize and characterize a new Dy(III) complex with a tri-aryl-substituted cyclopentadienyl ligand.
- To investigate the dynamic magnetic properties and relaxation mechanisms of the synthesized complex.
Main Methods:
- Synthesis of the Dy(III) complex [(CpAr3)4DyIII2Cl4K2]·3.5(C7H8).
- Magnetic susceptibility measurements to study dynamic magnetic properties.
- Analysis of magnetization relaxation under zero applied dc field.
Main Results:
- The Dy(III) complex exhibits slow relaxation of magnetization below 14.5 K.
- The relaxation is attributed to KD3 energy levels with an energy barrier of 136.9/133.7 cm⁻¹.
- Geometrical distortion and chloride coordination reduce the single-ion axial anisotropy energy barrier.
Conclusions:
- The synthesized Dy(III) complex displays slow magnetic relaxation, characteristic of single-molecule magnet behavior.
- The dynamic magnetic properties are influenced by the ligand environment and coordination geometry.
- Further studies can explore modifications to optimize magnetic performance.
More Related Videos
09:45Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
10:10Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
Published on: July 28, 2018
Related Concept Videos
02:42Valence Bond Theory
03:02Colors and Magnetism
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...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
01:19Complexation Equilibria: The Chelate Effect
01:26Diamagnetism
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....
02:51Metal-Ligand Bonds
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...