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Crystal Field Theory - Octahedral Complexes

Crystal 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...

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral 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,...

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Related Experiment Video

Updated: Jun 20, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

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Published on: September 8, 2016

Chemical Fields: Directing Atom Migration in the Multiphasic Nanocrystal.

Minki Jun¹, Taehyun Kwon¹, Yunchang Son¹

¹Department of Chemistry and Research Institute for Natural Science, Korea University, Seoul 02841, Republic of Korea.

Accounts of Chemical Research

|March 9, 2022

Summary

Atoms in nanoparticles migrate easily due to high surface energies, unlike bulk solids. Manipulating the "chemical field" (CF) directs this migration, enabling the synthesis of novel multiphasic nanocrystals for advanced applications.

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Published on: May 10, 2021

Area of Science:

Materials Science
Nanotechnology
Surface Chemistry

Background:

Atoms in bulk solids are fixed due to high migration energy barriers.
Nanoparticle atoms exhibit facile migration due to high surface energies.
Surface-binding moieties and structural features influence intrananoparticle atom migration.

Purpose of the Study:

To explore the potential of directing atom migration within multiphasic nanocrystals.
To enable the synthesis of diverse, geometrically well-defined multiphasic nanocrystals.
To leverage 'chemical fields' (CFs) for controlled atom movement and material design.

Main Methods:

Classification of multiphasic nanocrystals into metallic alloy and ionic systems.
Analysis of 'chemical field' (CF) factors influencing atom migration in each system.
Demonstration of CF manipulation as a synthetic strategy for multiphasic nanocrystals.

Main Results:

Identified migration-directing CFs for metallic atoms (element distribution, alloying, structural features).
Identified migration-directing CFs for ionic systems (ionic radii, phase stability, lattice strain, etc.).
Established CF manipulation as an effective strategy for synthesizing various multiphasic nanocrystals.

Conclusions:

The 'chemical field' concept provides a powerful framework for controlling atom migration in nanoparticles.
This approach facilitates the synthesis of complex multiphasic nanocrystals beyond conventional methods.
CF-based synthesis opens new avenues for diverse material compositions and geometries, particularly for catalysis.