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IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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VSEPR Theory

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Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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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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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Quantifying solvated electrons' delocalization.

Benjamin G Janesko1, Giovanni Scalmani, Michael J Frisch

  • 1Texas Christian University, Fort Worth, TX 76129, USA. b.janesko@tcu.edu.

Physical Chemistry Chemical Physics : PCCP
|May 22, 2015
PubMed
Summary
This summary is machine-generated.

We introduce the electron delocalization range (EDR) to quantify electron delocalization in solvated systems. This method reveals how electron correlation influences delocalization in hydrated electrons and lithium-ammonia clusters.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Physical Chemistry

Background:

  • Solvated electrons are crucial in various chemical phenomena.
  • Understanding electron delocalization is key to explaining properties of solutions.
  • Existing methods for measuring delocalization have limitations.

Purpose of the Study:

  • To introduce and apply the electron delocalization range (EDR) as a quantitative measure.
  • To investigate the delocalization of solvated electrons in different environments.
  • To explore the role of electron correlation in electron delocalization.

Main Methods:

  • Application of the electron delocalization range (EDR) formula.
  • Mean-field and correlated electronic structure calculations.
  • Modeling of electrons in one-dimensional cavities, hydrated electrons, and lithium-ammonia clusters.

Main Results:

  • The EDR effectively quantifies electron delocalization in model systems.
  • Density-matrix-based EDR aligns with molecular-orbital-based delocalization measures for hydrated electrons.
  • Electron correlation shifts delocalized electrons towards surfaces in hydrated and lithium-ammonia systems.

Conclusions:

  • The EDR is a versatile tool for studying electron delocalization in complex systems.
  • Electron correlation plays a significant role in the behavior of solvated electrons.
  • The EDR provides new insights into the insulator-to-metal transition in lithium-ammonia solutions.