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Bond Dissociation Energy and Activation Energy02:13

Bond Dissociation Energy and Activation Energy

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Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as bond dissociation energies when given for specific bonds or average bond energies when indicated for a given type of bond over many compounds. Firstly, the bond dissociation energy for a single bond is weaker than that of a double bond, which in turn is weaker than that of a triple bond. Secondly, hydrogen forms relatively strong bonds with...
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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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Valence Bond Theory02:42

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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 coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Types of Chemical Bonds

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Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
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Main Group Multiple Bonds for Bond Activations and Catalysis.

Catherine Weetman1

  • 1WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 7, 2020
PubMed
Summary

Researchers explore the reactivity of main group multiple bonds, focusing on small molecule activation. These compounds show potential for catalysis and synthesis, offering versatile applications for chemists.

Keywords:
bond activationcatalysismain groupmultiple bondssmall molecule activation

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Area of Science:

  • Chemistry
  • Inorganic Chemistry
  • Organic Chemistry

Background:

  • The discovery of "double-bond" rule exceptions has spurred rapid growth in main group multiple bond chemistry.
  • Homodiatomic and heterodiatomic multiple bonds are increasingly realized within the p-block elements.

Purpose of the Study:

  • To review the reactivity of main group multiple bonds, emphasizing small molecule activation.
  • To highlight the catalytic potential and synthetic utility of these compounds.

Main Methods:

  • Literature review of recent advancements in main group multiple bond chemistry.
  • Analysis of reactivity patterns, focusing on small molecule activation and catalytic applications.

Main Results:

  • Main group multiple bonds exhibit diverse reactivity, particularly in small molecule activation.
  • While their role as transition metal mimics is recognized, their intrinsic catalytic activity is currently limited.
  • These compounds serve as valuable synthons for further chemical functionalization.

Conclusions:

  • Main group multiple bonds are versatile tools for synthetic chemists.
  • Further exploration of their catalytic capabilities is warranted.
  • These molecules offer promising avenues for developing novel synthetic methodologies.