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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

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...
VSEPR Theory02:37

VSEPR Theory

Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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,...
Molecular Orbital Theory I02:35

Molecular Orbital Theory I

Overview of Molecular Orbital Theory
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

Molecular Orbital Energy Diagrams

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Related Experiment Video

Updated: Jul 10, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Tailoring the Electron Pairing Process in a Pt-I Charge-Density-Wave Chain.

Ying Luo1, Ning Zhou1, Yangbo Zhang1

  • 1Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, Hong Kong SAR, China.

Journal of the American Chemical Society
|July 8, 2026
PubMed
Summary

Researchers engineered a molecular superlattice that shifts electron pairing from localized to delocalized. This enhances conductivity by 1000x, offering new design principles for strongly correlated electronic materials.

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Revealing Dynamic Processes of Materials in Liquids Using Liquid Cell Transmission Electron Microscopy
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Last Updated: Jul 10, 2026

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Published on: December 20, 2012

Area of Science:

  • Solid-state chemistry
  • Materials science
  • Condensed matter physics

Background:

  • Electron pairing in solids drives phenomena like superconductivity and charge density waves (CDW).
  • Controlling electron pairing and charge order is crucial for designing advanced electronic materials.

Purpose of the Study:

  • To construct a novel molecular superlattice with tunable electron pairing.
  • To investigate the impact of interchain electrostatic interactions on electron correlation and charge order.

Main Methods:

  • Fabrication of a one-dimensional molecular superlattice with alternating Pt-I and Pt-Pt-I-I double-chains.
  • Analysis of electron pairing mechanisms and charge density wave formation.

Main Results:

  • Demonstrated a shift from localized to delocalized, multisite electron pairing via interchain electrostatic interactions.
  • Stabilized the first iodide-bridged Pt(III) charge density wave (CDW) chain.
  • Achieved a ~3 orders of magnitude increase in bulk conductivity compared to localized states.

Conclusions:

  • Established a versatile chemical strategy for manipulating electron correlations and charge orders at the molecular level.
  • Provided a new design principle for strongly correlated electronic materials with enhanced conductivity.