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Finding a soft spot for vanadium: a P-bound OCP ligand.

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Researchers explored the phosphaethynolate ion ([OCP]-) coordination with a vanadium(iii) complex. This study presents the first 3d early transition metal binding of [OCP]- via the P-atom, challenging traditional Lewis acid-base theory.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Chemistry

Background:

  • Phosphaethynolate ion ([OCP]-) typically coordinates to metal ions based on Lewis acid-base principles.
  • Hard early transition metals favor O-bound coordination, while soft late transition metals prefer P-bound coordination.

Purpose of the Study:

  • To investigate the coordination behavior of the phosphaethynolate ion ([OCP]-) with a vanadium(iii) complex.
  • To report the first instance of a 3d early transition metal binding the [OCP]- ion via the P-atom.

Main Methods:

  • Transmetallation reactions using a V(iii) complex, [(nacnac)VCl(OAr)] (1).
  • Characterization of the resulting complex, [(nacnac)V(OAr)(PCO)] (2), using HFEPR spectroscopy and SQuID measurements.
  • Theoretical studies to support experimental findings.

Main Results:

  • The vanadium(iii) complex successfully transmetallated the [OCP]- ion.
  • The resulting complex, [(nacnac)V(OAr)(PCO)] (2), exhibits P-atom coordination of the [OCP]- ligand.
  • This represents the first observed P-bound coordination of [OCP]- to a 3d early transition metal.

Conclusions:

  • The coordination of [OCP]- to early transition metals is not strictly limited by classical Lewis acid-base theory.
  • Vanadium(iii) complexes can facilitate P-bound coordination of the phosphaethynolate ion.
  • This finding expands the understanding of ligand coordination in organometallic chemistry.