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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,...

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...

X-ray Crystallography

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...

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Related Experiment Video

Updated: Jul 2, 2025

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Isotope Effect-Enabled Crystal Enlargement in Metal-Organic Frameworks.

Lixi Chen¹, Junhao Lu¹, Xiaoqi Li¹

¹State Key Laboratory of Radiation Medicine and Protection, School for Radiological and interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, China.

Journal of the American Chemical Society

|February 29, 2024

Summary

Isotopic substitution is a novel method to grow larger metal-organic framework (MOF) single crystals by slowing nucleation. This technique significantly increases crystal size and improves X-ray detection limits for MOF applications.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

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Published on: February 10, 2023

Area of Science:

Materials Science
Crystallography
Chemical Engineering

Background:

Synthesizing large metal-organic framework (MOF) single crystals is challenging due to rapid nucleation kinetics.
Existing methods struggle to achieve significant size increases across diverse MOF types.

Purpose of the Study:

To develop a general strategy for enhancing MOF single crystal size.
To investigate the impact of isotopic substitution on MOF crystallization and crystal growth.

Main Methods:

Employed a simple isotopic substitution strategy to inhibit nucleation in MOF synthesis.
Utilized in situ characterizations to analyze the effect of isotopes on crystallization kinetics and nucleation barriers.

Main Results:

Achieved substantial increases in MOF crystal volume, ranging from 1.7- to 165-fold.
Synthesized the largest reported MOF single crystal (2.9 cm × 0.48 cm × 0.23 cm) via a one-pot method.
Demonstrated a 33% improvement in X-ray dose rate detection limit for isotope-enlarged crystals.

Conclusions:

Isotopic substitution effectively retards crystallization kinetics and increases nucleation energy barriers, leading to larger crystals.
This approach provides a general method for growing large MOF single crystals and enhances their performance in applications like X-ray detection.