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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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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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.
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Published on: February 15, 2016

Stability and physicochemical principles for icosahedral Ti12X (X = Li to Xe) clusters: a DFT study.

M Salazar-Villanueva1, P H Hernandez Tejeda, J F Rivas-Silva

  • 1Institute de Física, Universidad Autónoma de Puebla, Apdo. Postal J-48, Puebla, Pue. 72570, Mexico.

Journal of Nanoscience and Nanotechnology
|June 25, 2008
PubMed
Summary

Doping titanium clusters (Ti12X) with specific elements like C, Si, P, and Te enhances their stability and electronic properties. These findings suggest potential applications in advanced materials for sensors, catalysis, and medicine.

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Area of Science:

  • Computational materials science
  • Quantum chemistry

Background:

  • Titanium clusters are of interest for their unique electronic and stability properties.
  • Understanding how doping affects these properties is crucial for material design.

Purpose of the Study:

  • To investigate the stability and electronic properties of Ti12X clusters.
  • To identify dopant elements that enhance cluster stability and predict experimental feasibility.

Main Methods:

  • Utilized generalized gradient approximation within density functional theory.
  • Analyzed cluster structures, electronic structure, and physicochemical properties.
  • Calculated energy gains and HOMO-LUMO gaps for various dopants (X = Li to Xe).

Main Results:

  • Several elements, including C, Si, P, Co, Ge, Ru, and Te, significantly improve Ti13 cluster stability through central atom substitution.
  • Elements C, Si, P, and Te were identified as most likely to be experimentally observed due to their large HOMO-LUMO gaps.
  • Physicochemical analysis predicted chemical affinity and novel properties for the most stable clusters.

Conclusions:

  • Doping offers a viable strategy to tune the stability and electronic characteristics of titanium clusters.
  • The identified dopants and stable cluster configurations open new avenues for applications in chemical sensors, catalysis, and medicine, emphasizing chemical selectivity.