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Phosphine-stabilized arsenium salts: water-stable, labile, coordination complexes.

Keith A Porter1, Anthony C Willis, Johann Zank

  • 1Research School of Chemistry, Institute of Advanced Studies, Australian National University, Canberra, ACT 0200, Australia.

Inorganic Chemistry
|November 26, 2002
PubMed
Summary
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New phosphine-stabilized arsenium salts are air- and water-stable, featuring trigonal pyramidal arsenic stereochemistry. These compounds undergo phosphine exchange and nucleophilic attack, yielding tertiary arsines and arsinous acid esters.

Area of Science:

  • Organometallic Chemistry
  • Main Group Chemistry
  • Coordination Chemistry

Background:

  • Tertiary phosphine-stabilized arsenium salts represent a novel class of compounds with potential applications in catalysis and materials science.
  • Understanding their structural and reactivity properties is crucial for developing new synthetic methodologies and exploring their chemical behavior.

Purpose of the Study:

  • To synthesize and characterize novel air- and water-stable tertiary phosphine-stabilized arsenium salts.
  • To elucidate the structural features and bonding characteristics of these complexes using X-ray crystallography.
  • To investigate the reactivity of these arsenium salts towards nucleophilic attack and phosphine exchange.

Main Methods:

  • Synthesis of tertiary phosphine-stabilized arsenium salts of the type R(3)P-->AsR(2)(+)PF(6)(-).

Related Experiment Videos

  • Isolation and characterization of crystalline complexes, including two chiral triarylphosphine complexes.
  • X-ray crystallographic analysis to determine the precise molecular structures and stereochemistry around arsenic.
  • Investigation of reactivity through nucleophilic attack by anionic carbon and oxygen nucleophiles and observation of phosphine exchange.

    • Main Results:

    • Successful isolation of air- and water-stable tertiary phosphine-stabilized arsenium salts.
    • Crystal structures reveal trigonal pyramidal arsenic stereochemistry with the phosphorus atom in the apical position and an As-P bond orthogonal to the arsenium ion plane.
    • Stabilization of the arsenium ion through conjugation of the lone pair with a phenyl group.
    • Identification of a counteractive chelate effect in a specific adduct, destabilizing the As-P bond.
    • Demonstration of rapid phosphine exchange and nucleophilic attack at arsenic by anionic nucleophiles.

    Conclusions:

    • Tertiary phosphine-stabilized arsenium salts are isolable and structurally well-defined compounds.
    • The observed stereochemistry and stabilization mechanisms provide insights into the electronic properties of these unique arsenic species.
    • Despite their stability, these salts exhibit reactivity towards nucleophiles and undergo ligand exchange, suggesting potential for further synthetic transformations.