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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Cyclic Group 15 Radical Cations.

Angelika Brückner1, Alexander Hinz2, Jacqueline B Priebe1

  • 1Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock (Germany).

Angewandte Chemie (International Ed. in English)
|May 12, 2015
PubMed
Summary

Cyclic radical cations of dipnictadiazanes were synthesized via one-electron oxidation. These novel compounds exhibit a unique transannular π bond, showcasing localized spin density on pnictogen centers.

Keywords:
arsenicgroup 15 elementsoxidationphosphorusradical

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Radical Chemistry

Background:

  • Cyclo-1,3-dipnicta-2,4-diazane-1,3-diyls feature pnictogen elements (P, As) within a heterocyclic ring.
  • These compounds are precursors to novel radical species with potential applications in materials science.

Purpose of the Study:

  • To synthesize and characterize novel cyclic radical cations derived from dipnictadiazanes.
  • To investigate the electronic structure and bonding in these radical cations.
  • To explore the influence of counteranions on the oxidation process.

Main Methods:

  • One-electron oxidation of dipnictadiazane precursors using silver salts with weakly coordinating anions.
  • Characterization of radical cations using Electron Paramagnetic Resonance (EPR) spectroscopy.
  • Computational studies (e.g., DFT) to analyze spin density distribution and bonding.

Main Results:

  • Successful synthesis of cyclic radical cations [E(μ-NTer)2E](+·) via oxidation with [AgLn][B(C6F5)4].
  • Formation of covalent bonds by smaller, basic anions, leading to dipnictadiazanes [FP(μ-NTer)2PF] and [(CF3CO2)P(μ-NTer)2P(CF3CO2)].
  • EPR and computational data confirm spin density localization on the pnictogen centers.
  • Identification of a rare transannular one-electron π bond without a σ bond in the radical cations.

Conclusions:

  • Dipnictadiazanes can be selectively oxidized to stable radical cations.
  • The nature of the counteranion critically influences the reaction outcome, dictating either radical cation formation or covalent bond addition.
  • The observed bonding in the radical cations represents a significant finding in the study of unusual bonding motifs.