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Related Concept Videos

Chemical Reactions01:19

Chemical Reactions

A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
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Covalent Bonding and Lewis Structures

Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
Chemical Bonds02:40

Chemical Bonds


Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
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Chemical Reactions02:26

Chemical Reactions

A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A reaction’s stoichiometry helps predict how much of the reactant is needed to produce the desired amount of product, or in some cases, how much product will be formed from a specific amount of the reactant.
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Introduction to Chemical Bonds01:01

Introduction to Chemical Bonds

Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...

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Chemical bonding variations and electron-phonon interactions.

Shuiquan Deng1, Arndt Simon, Jürgen Köhler

  • 1Contribution from the Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

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Summary

Researchers introduced a new bonding functional, Psib(Phi), to study electronic states in solids. This method explains bonding variations due to electron-phonon coupling, clarifying phenomena like "flat band" states.

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Area of Science:

  • Solid-state physics
  • Quantum chemistry

Background:

  • Understanding electronic states and bonding is crucial in solid-state physics.
  • Electron-phonon coupling significantly influences material properties.
  • Mulliken's electron partitioning provides a framework for analyzing chemical bonding.

Purpose of the Study:

  • Introduce a novel functional, Psib(Phi), for characterizing electronic states in solids.
  • Utilize Psib(Phi) to investigate bonding variations induced by electron-phonon coupling.
  • Explain observed differences in electronic structures, such as "flat band" states.

Main Methods:

  • Developed a new functional, Psib(Phi), based on the B(tau,tau") bonding indicator.
  • Employed Mulliken's electron partitioning approach for electron distribution analysis.
  • Applied the Psib(Phi) functional to study electron-phonon coupling effects.

Main Results:

  • The Psib(Phi) functional successfully captures bonding variations in electronic states.
  • Electron-phonon coupling effects on electronic states are effectively analyzed using Psib(Phi).
  • The approach explains the distinction between "flat band" states and peaklike structures in electron-phonon coupling constants.

Conclusions:

  • Psib(Phi) offers a valuable new tool for studying electronic states and bonding in solids.
  • The functional provides insights into the role of electron-phonon coupling in material properties.
  • This method enhances the understanding of complex electronic phenomena in condensed matter physics.