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Related Concept Videos

Lewis Acids and Bases02:33

Lewis Acids and Bases

48.4K
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.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
48.4K
Lewis Acids and Bases02:16

Lewis Acids and Bases

17.2K
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...
17.2K
Formation of Complex Ions03:45

Formation of Complex Ions

26.1K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
26.1K
Lewis Symbols and the Octet Rule02:36

Lewis Symbols and the Octet Rule

80.8K
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.
80.8K
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

61.3K
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.
61.3K
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

45.2K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
45.2K

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Negative Additive Manufacturing of Complex Shaped Boron Carbides
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Negative Additive Manufacturing of Complex Shaped Boron Carbides

Published on: September 18, 2018

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Bidentate Boron Lewis Acids: Selectivity in Host-Guest Complex Formation.

Philipp Niermeier1, Sebastian Blomeyer1, Younes K J Bejaoui1

  • 1Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien CM2, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany.

Angewandte Chemie (International Ed. in English)
|December 22, 2018
PubMed
Summary

New bidentate boron Lewis acids were synthesized with high selectivity and yield. These compounds form stable adducts with nitrogen bases, showing selective guest exchange and interesting dynamic behavior.

Keywords:
1,8-diethynylanthracenehost-guest complexesmolecular recognitionpoly-Lewis acidstin-boron exchange

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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry

Background:

  • Development of novel Lewis acids is crucial for catalysis and molecular recognition.
  • Anthracene-based frameworks offer unique structural and electronic properties.

Purpose of the Study:

  • To synthesize novel bidentate boron Lewis acids utilizing a 1,8-diethynylanthracene scaffold.
  • To investigate the complexation behavior and structural characteristics of these Lewis acids with nitrogen bases.

Main Methods:

  • Two-step synthesis involving stannylation and tin-boron exchange.
  • X-ray diffraction for structural characterization of adducts.
  • Competition experiments and low-temperature NMR spectroscopy for studying guest exchange and dynamic behavior.

Main Results:

  • Selective synthesis of bidentate boron Lewis acids in high yield and purity.
  • Formation of stable adducts with pyridine, pyrimidine, and TMEDA.
  • Demonstrated selective guest exchange and provided insights into the energetics and dynamics of the adducts.

Conclusions:

  • The synthesized 1,8-diethynylanthracene-based boron Lewis acids are effective in forming stable complexes with nitrogen bases.
  • The study provides a foundation for designing sophisticated supramolecular systems and Lewis acid catalysts.