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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,...

Crystal Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...

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...

Thermal Electrocyclic Reactions: Stereochemistry

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.

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Related Experiment Video

Updated: Sep 14, 2025

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Crystal Orientation Engineering for Energy Storage and Conversion Applications.

Yizhou Wang^1,2, Jianyu Chen³, Tianchao Guo²

¹Center for Renewable Energy and Storage Technologies (CREST), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.

Advanced Materials (Deerfield Beach, Fla.)

|July 25, 2025

Summary

Crystal orientation engineering is key for advanced renewable energy devices. This review details how controlling crystal alignment enhances material properties for better energy storage and conversion technologies.

Keywords:

crystal orientation crystal texture energy harvesting energy storage orientation engineering

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Last Updated: Sep 14, 2025

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Area of Science:

Materials Science
Energy Science
Nanotechnology

Background:

Conventional material design for energy technologies focused on morphology and defects.
Emerging research highlights crystal orientation engineering for exploiting anisotropic properties.

Purpose of the Study:

To provide a comprehensive review of crystal orientation engineering for energy applications.
To discuss its impact on material properties and technological advancements.

Main Methods:

Review of material properties influenced by crystal orientation (conductivity, surface energy, etc.).
Summary of characterization techniques (XRD, TEM, SEM, Raman, optical microscopy).
Overview of bottom-up and top-down strategies for orientation control.

Main Results:

Crystal orientation significantly affects electrical, dielectric, surface, and ionic properties.
Various techniques effectively characterize and engineer crystal orientation.
Demonstrated advances in electrocatalysis, solar cells, nanogenerators, and energy storage devices.

Conclusions:

Crystal orientation engineering is a powerful approach to enhance renewable energy technologies.
Further research holds significant potential for future energy transition solutions.