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Nucleophilic Substitution14:21

Nucleophilic Substitution

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Source: Vy M. Dong and Daniel Kim, Department of Chemistry, University of California, Irvine, CA
Nucleophilic substitution reactions are among the most fundamental topics covered in organic chemistry. A nucleophilic substitution reaction is one where a nucleophile (electron-rich Lewis base) replaces a leaving group from a carbon atom.
SN1 (S = Substitution, N = Nucleophilic, 1 = first-order kinetics)
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Nucleophilic Substitution: SN1 and SN2 Reactions
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β-Arylethynyl substituted silver corrole complexes.

Manuela Stefanelli1, Antonella Ricci, Marco Chiarini

  • 1Department of Chemical Science and Technologies, University of Roma Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy. roberto.paolesse@uniroma2.it.

Dalton Transactions (Cambridge, England : 2003)
|September 4, 2019
PubMed
Summary
This summary is machine-generated.

Silver corrolates are key in functionalization reactions. New silver corrole complexes with varied substituents show tunable spectral properties and potential for click chemistry, suggesting an innocent ligand behavior.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Silver corrolates are valuable in synthesis and theory due to their role in peripheral functionalization.
  • The electronic behavior of the corrole ligand (innocent or noninnocent) presents a descriptive challenge.

Purpose of the Study:

  • To synthesize and characterize silver 3,17-disubstituted triarylcorrole complexes with diverse functionalities.
  • To investigate how substituents affect electron density, spectral characteristics, and reactivity.
  • To explore the potential for click chemistry with novel corrole architectures.

Main Methods:

  • Stille coupling reaction for synthesis of silver corrole complexes.
  • Spectroscopic analysis (UV-Vis) to determine electronic properties.
  • Electrochemical measurements to assess redox behavior.
  • Single crystal X-ray crystallography for structural characterization.
  • Density Functional Theory (DFT) calculations for electronic structure analysis.

Main Results:

  • Silver corrole complexes with halogens and phenylethynyl units were synthesized in high yields (54-92%).
  • Substituted ethynyl groups caused red-shifts in electronic absorption spectra, most notably with β-NO2-Ph-C≡C substituents.
  • Electrochemical studies revealed easier reduction for the nitro-substituted complex.
  • DFT calculations confirmed electron delocalization over the p-nitrophenylethynyl unit, impacting orbital distributions and spectra.
  • Macrocycle saddling was only moderately affected by β-substituent variation.

Conclusions:

  • The synthesized silver corrole complexes exhibit tunable electronic and spectral properties based on substituent modifications.
  • The presence of electron-withdrawing groups like NO2 significantly influences the macrocycle's electron density and redox potential.
  • The study suggests these silver corrolates can be described as Ag(III)-corrolate(3-), indicating an innocent macrocyclic ligand.
  • A derivative with terminal acetylenic units offers a platform for "click" reactions, enabling the construction of new corrole-based materials.