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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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IR Absorption Frequency: Delocalization01:04

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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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,...
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Bonding in Metals02:32

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Related Experiment Video

Updated: May 25, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Nonmelting Disordering Facilitated by Electron Delocalization.

Dasol Kim1,2, Sungwon Kim3,4, Jisu Jung5

  • 1Aachen. I. Institute of Physics, Physics of Novel Materials, RWTH-Aachen University, 52056 Aachen, Germany.

ACS Nano
|February 26, 2025
PubMed
Summary

Atomic disordering for neuromorphic engineering can occur without melting, challenging traditional theories. Delocalized electrons enable faster disordering, improving energy efficiency in phase-change materials.

Keywords:
amorphizationmetavalent bondingnonmeltingphase-change memoryultrafast

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Atomic disordering in materials enables advanced functionalities like phase-change memory and photonic computing, crucial for neuromorphic engineering.
  • High energy consumption during disordering, traditionally linked to melting, limits data reliability and device integration efficiency.

Purpose of the Study:

  • To challenge the conventional melt-quenching theory of atomic disordering.
  • To investigate the kinetics of disordering in various materials under isochronal and isochoric conditions.
  • To elucidate the role of electronic structure in the disordering process and its impact on energy efficiency.

Main Methods:

  • Experimental investigation of disordering times in pure Sb, Ag-In-Sb-Te, In, and InSb.
  • Theoretical calculations to analyze the influence of electronic structure and bonding on atomic mobility.
  • Comparison of disordering behavior across materials with varying melting points and laser absorption rates.

Main Results:

  • Disordering times varied significantly, with Sb, Ag-In-Sb-Te, and In exhibiting much slower disordering than InSb.
  • Theoretical calculations revealed that delocalized electrons facilitate bond length modification below melting points, enabling atomic displacement.
  • Metavalent and metallic bonding, driven by delocalized electrons, allow for disordering without melting, explaining the observed differences in disordering rates.

Conclusions:

  • Atomic disordering can occur below the melting point, driven by electronic properties rather than solely thermal effects.
  • Delocalized electrons and specific bonding types (metavalent, metallic) are key factors for efficient, low-energy atomic disordering.
  • Design principles for energy-efficient phase-change materials should prioritize electron delocalization over high melting points.