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A zwitterionic triphosphenium compound as a tunable multifunctional donor.

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Dalton Transactions (Cambridge, England : 2003)
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Researchers synthesized a novel triphosphenium zwitterion with multiple phosphorus coordination states. Reactivity studies revealed selective reactions at the phosphine group, explained by density functional theory.

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Area of Science:

  • Organophosphorus Chemistry
  • Coordination Chemistry
  • Computational Chemistry

Background:

  • Exploration of novel phosphorus-containing compounds with diverse coordination environments.
  • Understanding the reactivity of multidentate ligands in coordination chemistry.

Purpose of the Study:

  • To synthesize and characterize a new triphosphenium zwitterion.
  • To investigate the reactivity of this zwitterion with various electrophiles.
  • To rationalize the observed reactivity using theoretical calculations.

Main Methods:

  • Synthesis of a novel triphosphenium zwitterion from a 1,2,4-tris-(diphenylphoshinyl)cyclopentadienyl framework.
  • Reactivity studies involving protons, elemental sulfur, and gold(i) chloride.
  • Density functional theory (DFT) investigations to rationalize reactivity.

Main Results:

  • Successful preparation of a triphosphenium zwitterion with di-, tri-, and tetra-coordinate phosphorus centers.
  • Demonstrated preferential reactivity of the pendant phosphine group over the P(i) center in reactions.
  • DFT calculations provided insights into the electronic factors governing this selectivity.

Conclusions:

  • The novel triphosphenium zwitterion serves as a versatile ligand with distinct reactive sites.
  • The pendant phosphine group exhibits higher reactivity compared to the P(i) center.
  • DFT studies successfully explain the observed chemoselectivity in the reactions.