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Ionization Energy03:12

Ionization Energy

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The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
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Ionization and Electron Attachment for Nucleobases in Water.

Yan Zhang1,2, Peng Xie3, Songqiu Yang1

  • 1State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics , Chinese Academy of Science , Zhongshan Road 457 , Dalian 116023 , China.

The Journal of Physical Chemistry. B
|January 15, 2019
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Investigating nucleobases in water using QM/MM methods, this study found that water significantly impacts ionization and electron attachment. Electron localization and energy shifts are crucial in these aqueous processes.

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Area of Science:

  • Computational chemistry
  • Biophysical chemistry
  • Quantum mechanics

Background:

  • Nucleobases are fundamental components of DNA and RNA.
  • Understanding their behavior in aqueous environments is crucial for molecular biology and medicine.
  • Ionization and electron attachment processes are key to nucleobase reactivity.

Purpose of the Study:

  • To investigate ionization and electron attachment for nucleobases in water using a combined quantum mechanical/molecular mechanical (QM/MM) method.
  • To determine the influence of explicit aqueous solvent on the electronic properties of nucleobases.
  • To compute vertical and adiabatic ionization energies and electron affinities.

Main Methods:

  • Employed a combined quantum mechanical/molecular mechanical (QM/MM) computational approach.
  • Optimized simulation parameters including snapshot number (20) and QM-region size (~100 atoms) for converged results.
  • Calculated vertical ionization energies (VIEs), adiabatic ionization energies, vertical electron affinities, adiabatic electron affinities, and vertical detachment energies for five nucleobases.

Main Results:

  • Computational VIEs for cytosine and thymine showed good agreement with experimental aqueous solution data.
  • QM-region polarization by bulk water significantly affects ionization and electron attachment processes.
  • Holes or excess electrons were found not to entirely localize on the nucleobases.
  • QM-region polarization and atomic movements led to substantial decreases in cationic and anionic energies (~2.1 eV for cation, ~2.9 eV for anion) during structural relaxation.
  • Potential energy surfaces for cations and anions become very steep near equilibrium structures.

Conclusions:

  • The aqueous environment plays a critical role in the electronic behavior of nucleobases during ionization and electron attachment.
  • QM/MM simulations provide valuable insights into the solvation effects on nucleobase electronic states.
  • Further studies on the dynamics of these processes are warranted due to the steep potential energy surfaces observed.