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Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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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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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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The electronic structure of silver clusters.

Yong Lei1, Gao-Feng Zhao, Zhi Zeng

  • 1College of Math and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, PR China.

Journal of Nanoscience and Nanotechnology
|December 4, 2010
PubMed
Summary
This summary is machine-generated.

This study reveals that 5s electrons drive silver cluster properties, while localized 4d electrons also influence them through hybridization. Cluster properties are size-dependent, with increasing d character as silver clusters grow.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Quantum mechanics

Background:

  • Silver clusters exhibit unique electronic and chemical properties.
  • Understanding electron behavior in metallic clusters is crucial for materials design.

Purpose of the Study:

  • To investigate the electronic structures of silver clusters (Ag(n), n=3-12).
  • To determine the roles of 4d and 5s electrons in cluster bonding and properties.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Local Spin Density Approximation (LSDA) for electronic structure analysis.

Main Results:

  • 4d electrons in silver clusters are highly localized.
  • 5s electrons are extensive and primarily responsible for cluster bonding.
  • Hybridization between 4d and 5s electrons influences cluster properties.
  • The contribution of d character to cluster properties increases with cluster size.

Conclusions:

  • Silver cluster properties are predominantly governed by 5s electrons.
  • 4d electrons, despite being localized, play a significant role through hybridization.
  • Electronic structure and properties of silver clusters evolve with size.