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Lewis Symbols and the Octet Rule02:36

Lewis Symbols and the Octet Rule

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Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds.
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Lewis Structures and Formal Charges02:19

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Lewis symbols can be used to indicate the formation of covalent bonds, which are shown in Lewis structures—drawings that describe the bonding in molecules and polyatomic ions. The periodic table can be used to predict the number of valence electrons in an atom and the number of bonds that will be formed to reach an octet. Group 18 elements, such as argon and helium, have filled electron configurations and thus rarely participate in chemical bonding. However, atoms from group 17, such as...
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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

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This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
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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.
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Frustrated Lewis pair chemistry: development and perspectives.

Douglas W Stephan1, Gerhard Erker2

  • 1Department of Chemistry, University of Toronto, 80 St. George St, Toronto, Ontario M5S3H6 (Canada). dstephan@chem.utoronto.ca.

Angewandte Chemie (International Ed. in English)
|May 15, 2015
PubMed
Summary

Frustrated Lewis pairs (FLPs) enable unique chemical reactions by preventing strong acid-base binding. These metal-free systems activate small molecules, particularly for catalytic hydrogenation, opening new synthetic pathways.

Keywords:
cooperative reactionsfrustrated Lewis pairsmetal-free hydrogenationsmall-molecule activation

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Area of Science:

  • * Inorganic Chemistry
  • * Organic Chemistry
  • * Catalysis

Background:

  • * Frustrated Lewis pairs (FLPs) are Lewis acids and bases that avoid strong adduct formation due to steric or electronic hindrance.
  • * This unique characteristic allows FLPs to engage in novel cooperative reactions with various substrates.
  • * FLPs have demonstrated remarkable capabilities in small-molecule activation, leading to new reaction discoveries.

Purpose of the Study:

  • * To review the current advancements in the field of Frustrated Lewis pairs (FLPs).
  • * To highlight the role of FLPs in metal-free catalytic hydrogenations via hydrogen activation.
  • * To consider future research directions and potential impacts of FLP chemistry.

Main Methods:

  • * Literature review of recent studies on Frustrated Lewis pairs (FLPs).
  • * Analysis of FLP mechanisms for small-molecule activation and catalysis.
  • * Discussion of hydrogen activation and subsequent transformations mediated by FLPs.

Main Results:

  • * FLPs facilitate unprecedented reaction pathways through cooperative substrate activation.
  • * Metal-free catalytic hydrogenations are a significant application, driven by FLP-mediated hydrogen activation.
  • * A growing body of research demonstrates the versatility and potential of FLPs.

Conclusions:

  • * Frustrated Lewis pairs represent a powerful tool for developing novel metal-free catalytic processes.
  • * The field is rapidly expanding, with significant potential for future discoveries in synthesis and catalysis.
  • * Continued exploration of FLPs promises to broaden their impact across various chemical disciplines.