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Researchers synthesized novel peri-substituted naphthalene complexes with antimony and bismuth. They investigated their redox behavior, successfully isolating a unique stibane-coordinated stibenium cation and a distibane derivative.

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Area of Science:

  • Organometallic Chemistry
  • Main Group Chemistry
  • Coordination Chemistry

Background:

  • Peri-substituted naphthalene complexes offer unique steric and electronic environments.
  • The redox behavior of heavy p-block element complexes is underexplored.
  • Understanding the reactivity of antimony and bismuth in coordination complexes is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize novel peri-substituted naphthalene complexes of antimony and bismuth.
  • To investigate the redox properties of these complexes.
  • To explore the formation and stability of unusual cationic and neutral species involving antimony.

Main Methods:

  • Synthesis of peri-substituted naphthalene complexes (Trip2Pn)2Naph (Pn = Sb, Bi).
  • Electrochemical oxidation and reduction studies using [Fc][BArF] and KC8.
  • Characterization using Nuclear Magnetic Resonance (NMR) and Infrared (IR) spectroscopy.
  • Structural determination via single-crystal X-ray diffraction (sc-XRD).
  • Analysis of electronic structures using quantum chemical computations.

Main Results:

  • Successful synthesis of antimony and bismuth peri-substituted naphthalene complexes.
  • Oxidation of the antimony complex yielded a stibane-coordinated stibenium cation [(Trip2Sb)(TripSb)Naph]+.
  • Reduction of the stibenium cation afforded a distibane derivative (TripSb)2Naph.
  • Structural and spectroscopic data confirmed the proposed structures.
  • Computational analysis provided insights into the electronic structures of the investigated species.

Conclusions:

  • The study demonstrates the feasibility of synthesizing and manipulating peri-substituted naphthalene complexes with heavy p-block elements.
  • The isolation of a stibane-coordinated stibenium cation highlights novel reactivity pathways for antimony.
  • These findings contribute to the fundamental understanding of organometallic chemistry involving antimony and bismuth.