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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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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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Systematic cluster growth: a structure search method for transition metal clusters.

Peter L Rodríguez-Kessler1, Adán R Rodríguez-Domínguez, Alvaro Muñoz-Castro

  • 1Grupo de Química Inorgánica y Materiales Moleculares, Facultad de Ingeniería, Universidad Autónoma de Chile, El Llano Subercaseaux, 2810, Santiago, Chile. rodriguezkessler.p@gmail.com alvaro.munoz@uautonoma.cl.

Physical Chemistry Chemical Physics : PCCP
|February 23, 2021
PubMed
Summary

The systematic cluster growth (SCG) method efficiently finds transition metal cluster structures. This computational approach significantly reduces the search for global minima, aiding in understanding cluster growth patterns.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Investigating the structural evolution and growth patterns of transition metal clusters is crucial for understanding their properties.
  • Traditional methods can be computationally expensive for locating global minima on potential energy surfaces.

Purpose of the Study:

  • To introduce and validate the systematic cluster growth (SCG) method for efficient structure searching of transition metal clusters.
  • To determine the ground state structures and growth patterns of various transition metal clusters (TMn) using SCG combined with DFT calculations.

Main Methods:

  • The systematic cluster growth (SCG) method, a biased structure search strategy, builds initial structures by adding one atom at a time to preceding isomers.
  • Validation performed using the Lennard-Jones (LJ) potential energy surface.
  • Application of SCG combined with Density Functional Theory (DFT) calculations (SCG-DFT) for transition metal clusters.

Main Results:

  • SCG found 93.7% of known solutions for LJ clusters up to n=80 with minimal local optimizations.
  • SCG-DFT successfully determined ground state structures and growth patterns for transition metal clusters (TM = Ti, Ni, Cu, Ag, Pt; n = 6-14).
  • The method's applicability to doped clusters was also discussed.

Conclusions:

  • The SCG method is a highly efficient strategy for global minima localization in cluster structure searches.
  • SCG-DFT provides a robust approach for investigating the structural evolution and growth patterns of transition metal clusters.
  • The method offers a valuable tool for computational materials science and chemistry research.