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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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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.
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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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Color in Coordination Complexes
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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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Interaction between ions and substituted buckybowls: a comprehensive computational study.

Alba Campo-Cacharrón1, Enrique M Cabaleiro-Lago, Jesús Rodríguez-Otero

  • 1Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, Campus de Lugo, Avda. Alfonso X El Sabio s/n, 27002, Lugo, Galicia, Spain.

Journal of Computational Chemistry
|May 29, 2014
PubMed
Summary

Computational studies reveal that substituted buckybowls form stable complexes with chloride anions, but sodium cation interactions vary significantly with substituents. Electrostatic interactions are key, but other factors influence complex stability.

Keywords:
ab initio calculations Symmetry Adapted Perturbation Theory calculationsanion-π interactionscation-π interactionsnoncovalent interactions

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Area of Science:

  • Computational chemistry
  • Supramolecular chemistry
  • Materials science

Background:

  • Corannulene and sumanene are fullerene fragments known as buckybowls.
  • These molecules can form complexes with ions, influencing their properties.
  • Understanding these interactions is crucial for designing new materials.

Purpose of the Study:

  • To computationally investigate the complexes formed by substituted buckybowls (corannulene and sumanene) with sodium cations and chloride anions.
  • To determine the stability of these complexes and the factors governing their formation.
  • To explore the effect of different substituents on the interaction strength.

Main Methods:

  • High-level computational chemistry methods, including SCS-MP2 extrapolated to the basis set limit.
  • Analysis of electrostatic, dispersion, and induction contributions to complex stability.
  • Evaluation of molecular electrostatic potential changes due to substitution.

Main Results:

  • All studied buckybowls form stable complexes with chloride anions, with binding energies ranging from -6 to -45 kcal/mol.
  • Sodium cation complexes show varied stability, from attractive (-36 kcal/mol) to slightly repulsive (2 kcal/mol), depending on substituents.
  • Anion complex stability is dominated by electrostatic interactions, while cation complexes are stabilized by induction, even with repulsive electrostatics.
  • Substituents primarily alter the molecular electrostatic potential, influencing electrostatic interactions.

Conclusions:

  • The stability of buckybowl-ion complexes is significantly influenced by the nature of the ion and the substituents on the buckybowl.
  • Electrostatic interactions play a major role, especially for anion complexes, while induction is crucial for cation complexes.
  • Accurate prediction of complex stability requires considering multiple interaction contributions beyond just electrostatics.