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A Lewis-basic, dionio-substituted phosphane.

Martyn P Coles1, Peter B Hitchcock

  • 1Department of Chemistry, University of Sussex, Falmer, Brighton, UK. m.p.coles@sussex.ac.uk

Chemical Communications (Cambridge, England)
|December 7, 2007
PubMed
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A novel bis(guanidine) compound reacts with dichlorophenylphosphine to form a dicationic phosphane. This phosphane unexpectedly forms a unique coordination compound with platinum, showcasing unusual phosphorus chemistry.

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Phosphorus Chemistry

Background:

  • Guanidine derivatives are versatile ligands in coordination chemistry.
  • Dicationic phosphorus species are rare and present unique reactivity.
  • Platinum complexes are important in catalysis and materials science.

Purpose of the Study:

  • To synthesize and characterize a novel dicationic phosphane derived from a bis(guanidine) ligand.
  • To investigate the coordination behavior of this dicationic phosphane with platinum.
  • To explore the structural and electronic properties of the resulting platinum complex.

Main Methods:

  • Synthesis of the bis(guanidine) ligand: 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (Hhpp).
  • Reaction of Hhpp with dichlorophenylphosphine (PPhCl2) to form the dicationic phosphane [H2C(hpp)2PPh]2+.

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  • Coordination of the phosphane with a platinum precursor to yield the platinum complex.

    • Main Results:

    • The successful synthesis of the dicationic phosphane [H2C(hpp)2PPh]2+ was confirmed.
    • An unprecedented coordination compound featuring the dicationic phosphane and platinum was formed.
    • Structural analysis revealed a unique bonding interaction despite the formally dicationic phosphorus center.

    Conclusions:

    • The bis(guanidine) ligand facilitates the formation of a stable dicationic phosphane.
    • This dicationic phosphane acts as a ligand in platinum coordination chemistry.
    • The study expands the understanding of bonding in unusual phosphorus compounds and their metal complexes.