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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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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...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Fluorine-based Zn salan complexes.

Nsikak B Essien1, Antal Galvácsi2, Csilla Kállay2

  • 1Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, UK. G.Kostakis@sussex.ac.uk.

Dalton Transactions (Cambridge, England : 2003)
|March 7, 2023
PubMed
Summary
This summary is machine-generated.

Two new zinc salan fluorine-based complexes were synthesized. These complexes show potential for sensing amines using fluorine NMR, though solvent coordination presents a challenge.

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Area of Science:

  • Coordination Chemistry
  • Fluorine Chemistry
  • Supramolecular Chemistry

Background:

  • Zinc salan complexes are versatile coordination compounds.
  • Fluorine-based complexes offer unique spectroscopic properties for sensing applications.
  • Atmospheric moisture absorption and solvent interactions can influence complex behavior in solution.

Purpose of the Study:

  • To synthesize and characterize novel zinc salan fluorine-based complexes.
  • To investigate the solution-state behavior (dimeric-monomeric equilibrium) of these complexes.
  • To evaluate their potential as chemosensors for amine detection using 19F NMR.

Main Methods:

  • Synthesis and characterization of racemic and chiral zinc salan fluorine-based complexes.
  • Solution studies using experimental and theoretical methods to determine equilibrium.
  • 19F NMR spectroscopy to assess amine sensing capabilities.

Main Results:

  • Successful synthesis of two Zn salan fluorine-based complexes from available materials.
  • Complexes exhibit susceptibility to atmospheric water absorption.
  • In DMSO-H2O solutions, a dimeric-monomeric equilibrium was observed.
  • Strongly coordinating solvents (water, DMSO) limit sensing efficiency due to slow analyte exchange.

Conclusions:

  • The synthesized Zn salan fluorine-based complexes are readily accessible.
  • These complexes can exist in solution as a dimeric-monomeric equilibrium.
  • While exhibiting amine sensing potential via 19F NMR, solvent coordination hinders practical application without analyte excess.