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Valence Bond Theory02:42

Valence Bond Theory

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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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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The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
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Bond-valence model for metal cluster compounds. II. Matrix effect.

Elena Levi1, Doron Aurbach, Olivier Isnard

  • 1Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|September 24, 2013
PubMed
Summary

The bond-valence model reveals lattice strains in transition metal (TM) cluster compounds. The matrix effect, a steric conflict, surprisingly stabilizes these chalcohalide materials by optimizing bond valences.

Keywords:
bond-valence parameterscluster compoundslattice strainsmatrix effect

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Area of Science:

  • Solid State Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • The bond-valence model was previously deemed unsuitable for transition metal (TM) cluster compounds.
  • A prior study (Levi et al., 2013) explored lattice strains from counter-cation steric conflicts in (TM)6-chalcohalides.
  • This work investigates the matrix effect, a steric conflict between the cluster and its surrounding coordination polyhedron.

Purpose of the Study:

  • To analyze the impact of the matrix effect on lattice strains within (TM)6-chalcohalides.
  • To evaluate how bond-valence parameters change due to steric interactions.
  • To determine the influence of the matrix effect on the stability of these cluster compounds.

Main Methods:

  • Application of the bond-valence model to analyze structural data of (TM)6-chalcohalides.
  • Focus on changes in bond-valence parameters to quantify steric effects.
  • Analysis of transition metal-ligand (TM-L) bond lengths and coordination environments.

Main Results:

  • The matrix effect induces significant strain in TM-L bonds for Nb, Mo, W, and Re chalcohalides.
  • Despite bond stretching, total TM valence violations are minimal due to compensatory TM-L bond compression.
  • The matrix effect generally leads to a positive influence on material stability.

Conclusions:

  • The bond-valence model effectively describes lattice strains and stabilization in (TM)6-chalcohalides, including the matrix effect.
  • The matrix effect stabilizes cluster compounds by reducing structural unit volumes and optimizing TM atom bonding.
  • This study highlights the utility of the bond-valence model in understanding complex inorganic materials.