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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Updated: May 9, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Published on: August 2, 2012

Charge-ordering transition in (TMTTF)2X explored via dilatometry.

Mariano de Souza1, Jean-Paul Pouget

  • 1Instituto de Geociências e Ciências Exatas-IGCE, Unesp-Univ Estadual Paulista, Departamento de Física, Caixa Postal 178, 13506-900 Rio Claro (SP), Brazil. mariano@rc.unesp.br

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 31, 2013
PubMed
Summary

Charge ordering in organic salts shows a phase transition. Thermal expansion experiments reveal insights into electron localization and lattice distortion effects on charge ordering.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Organic Electronics

Background:

  • Charge-ordering phenomena are a significant area of research in materials science.
  • Quasi-one-dimensional organic charge-transfer salts, specifically (tetramethyltetrathiafulvalene)2X [(TMTTF)2X], are key materials exhibiting these phenomena.
  • Existing literature inadequately details the interplay between electron localization and lattice distortion in stabilizing charge-ordering patterns.

Purpose of the Study:

  • To review and synthesize literature on charge-ordering phenomena in (TMTTF)2X salts.
  • To highlight the relationship between electron localization and lattice distortion in charge ordering.
  • To emphasize recent findings from thermal expansion experiments on these charge-transfer salts.

Main Methods:

  • Literature review of experimental studies on (TMTTF)2X salts.
  • Focus on thermal expansion measurements.
  • Analysis of charge-ordering transitions and related physical phenomena.

Main Results:

  • Charge-ordering transitions have been experimentally confirmed in various (TMTTF)2X materials.
  • Thermal expansion experiments provide a sensitive probe for charge-ordering transitions.
  • Evidence suggests a link between lattice distortions and the stabilization of charge-ordered states.

Conclusions:

  • Charge ordering in (TMTTF)2X salts is a complex phenomenon influenced by electron-lattice interactions.
  • Thermal expansion is a valuable technique for characterizing charge-ordering transitions.
  • Further research is needed to fully elucidate the role of lattice distortion in charge-ordering mechanisms.