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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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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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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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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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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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Formation of Complex Ions03:45

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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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CdS nanoclusters doped with divalent atoms.

Elisa Jimenez-Izal1, Jon M Azpiroz, Riti Gupta

  • 1Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), P.K. 1072, 20080, Donostia, Euskadi, Spain, elisa.jimenez@ehu.es.

Journal of Molecular Modeling
|June 9, 2014
PubMed
Summary
This summary is machine-generated.

This study explores encapsulating divalent ions within cadmium sulfide (CdS) nanoclusters. Results show chalcogen doping enhances stability, while alkaline earth metal doping

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Previous research predicted alkali metal and halogen atom trapping in ZnS and CdS nanoclusters.
  • The encapsulation of divalent ions (dianions and dications) in nanoclusters remains an unexplored area.
  • Such encapsulation could enable the isolation of divalent ions and form stable cluster-assembled materials.

Purpose of the Study:

  • To investigate the structure and stability of cadmium sulfide (CdS) nanoclusters doped with chalcogen (O, S, Se) and alkaline earth metal (Be, Mg, Ca) atoms.
  • To determine the feasibility of encapsulating divalent ions within CdS nanoclusters.
  • To analyze the impact of doping on the optical properties of CdS nanoclusters.

Main Methods:

  • Density Functional Theory (DFT) for structural and stability analysis.
  • Quantum Molecular Dynamics (QMD) simulations for thermal stability assessment.
  • Time-Dependent Density Functional Theory (TDDFT) for simulating optical absorption spectra.

Main Results:

  • Most studied CdS nanoclusters successfully trapped both chalcogen and alkaline earth atoms.
  • Chalcogen-doped CdS nanoclusters exhibited significant thermodynamic and thermal stability.
  • Alkaline earth metal doping resulted in limited thermal stability, highlighting the importance of dopant charge.
  • Optical absorption spectra showed a blueshift compared to bulk CdS, with doping causing notable shifts to lower energies.

Conclusions:

  • CdS nanoclusters can encapsulate divalent ions, with chalcogen doping providing superior stability.
  • The charge of the dopant atom is a critical factor for successful endohedral doping.
  • Doping significantly alters the optical properties of CdS nanoclusters, offering potential for new materials with tunable optoelectronic characteristics.