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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,...

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
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...

Atomic Spectroscopy: Effects of Temperature

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Electron Configurations

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...

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Related Experiment Video

Updated: Oct 9, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Temperature-dependent electronic structure of γ-phase CuI: first-principles insights.

Ze-Li Xu¹, Chang Yang¹, Yu-Ning Wu¹

¹Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai 200241, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|December 22, 2021

Summary

Copper iodide (CuI) exhibits a unique bandgap widening with increasing temperature, unlike most semiconductors. This research explores temperature effects on CuI

Keywords:

CuI electronic structure electron–phonon interaction first-principles simulation transparent semiconductor

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Last Updated: Oct 9, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Published on: June 9, 2023

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

Area of Science:

Materials Science
Condensed Matter Physics
Solid State Chemistry

Background:

Copper iodide (CuI) is a promising material for next-generation transparent displays.
Understanding its electronic properties under varying temperatures is crucial for device optimization.

Purpose of the Study:

To investigate the temperature-dependent electronic structures of the room-temperature phase of CuI (γ-CuI).
To elucidate the contributions of electron-phonon interaction and thermal expansion to bandgap changes.
To evaluate the impact of temperature on hole mobility in CuI.

Main Methods:

Density-functional-theory (DFT)-based calculations.
Analysis of bandgap renormalization due to electron-phonon (el-ph) coupling and lattice expansion.
Application of the Drude model to assess temperature-dependent effective masses and hole mobilities.

Main Results:

The bandgap of CuI widens with increasing temperature, a behavior contrary to most semiconductors.
Bandgap widening was quantified as 88.3 meV across a temperature range of 0–600 K.
Calculated hole mobilities, considering phonon scattering, show good agreement with experimental data.

Conclusions:

The study provides fundamental insights into the temperature effects on CuI's electronic structure.
Findings offer guidance for enhancing the performance of electronic and thermoelectric devices utilizing CuI.