Related Experiment Video
Updated: Jun 13, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Theoretical study of magnetostructural correlations in a family of triangular manganese(III) complexes
1School of Physical Science and Technology, Nanjing Normal University, Nanjing 210097, China. zhangyiquan@njnu.edu.cn
Abstract:
A theoretical density functional study of the magnetostructural correlations in a family of triangular [Mn(3)O](7+) systems is presented. Our calculations show that to obtain a good [Mn(3)O](7+) system with strong Mn-Mn ferromagnetic interactions and a large negative D value, we can first decrease tau formed by the two planes of Mn(1)NO(2-) and Mn(2)OO(2-) through changing the orientations of the terminal ligands involving mu-NO exchange pathways (this operation will weaken the Mn-Mn ferromagnetic interactions) to obtain a large negative D value, and then increase tau through distorting Mn-N-O-Mn angles and/or enlarge d (the deviation of the mu(3)-O(2-) ion from the [Mn(III)(3)] plane) to enhance the Mn-Mn ferromagnetic interactions.
Related Concept Videos
Colors 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 eye.
Valence Bond Theory
Crystal Field Theory - Octahedral Complexes
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...
Crystal 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,...
Ferromagnetism
Diamagnetism
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.
