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Thermal Sigmatropic Reactions: Overview

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...

Thermodynamic Potentials

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Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...

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Related Experiment Video

Updated: Aug 12, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Published on: March 19, 2017

Smart thermally responsive perovskite materials: Thermo-chromic application and density function theory calculation.

Ning Jiang¹, Shuming Chen¹, Jintao Wang¹

¹College of Physics, Changchun University of Science and Technology, Changchun, Jilin Province, China.

|January 27, 2023

Summary

Developing efficient perovskite smart windows is crucial for energy saving. This study uses density functional theory (DFT) to analyze perovskite phase transitions for advanced thermochromic applications.

Keywords:

DFT Perovskite Smart windows Thermochromic

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Area of Science:

Materials Science
Energy Science
Solid State Physics

Background:

Traditional building design faces challenges with energy consumption due to inefficient temperature control.
Standard glass allows uncontrolled solar energy, leading to significant indoor temperature fluctuations.
There is a growing need for green and efficient smart window technologies.

Purpose of the Study:

To investigate perovskite-based thermochromic smart windows.
To address the lack of theoretical analysis regarding phase transition mechanisms and crystal structure prediction in perovskites for smart windows.
To explore the application of Density Functional Theory (DFT) in understanding perovskite thermochromic properties.

Main Methods:

Utilized Density Functional Theory (DFT) calculations.
Extracted and analyzed typical cases from published literature.
Focused on crystal structure, electronic structure stability, interface engineering, and thermal characteristics.

Main Results:

Summarized key properties of perovskite materials relevant to thermochromic smart windows.
Provided a theoretical framework for analyzing perovskite phase transitions.
Highlighted the role of DFT in predicting and understanding material behavior.

Conclusions:

Perovskite materials show promise for developing advanced thermochromic smart windows.
DFT calculations are a valuable tool for theoretical analysis of perovskite crystal structures and properties.
This work lays the foundation for further DFT applications in thermochromic perovskite research.