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A fluorophosphate-based inverse Keggin structure.

John Fielden1, Kyle Quasdorf, Leroy Cronin

  • 1Ames Laboratory, Iowa State University, Ames, IA 50011, USA.

Dalton Transactions (Cambridge, England : 2003)
|July 24, 2012
PubMed
Summary

Researchers discovered a novel "inverse Keggin" polyanion, [Mo(12)O(46)(PF)(4)](4-), formed from a Keplerate. Copper(II) complexes guided the formation of this unique inorganic structure.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Polyoxometalates (POMs) are versatile inorganic clusters with diverse structures and applications.
  • Keplerates represent a unique class of POMs with remarkable size and complexity.
  • The controlled synthesis of novel POM architectures remains a significant challenge.

Purpose of the Study:

  • To investigate the degradation pathway of an {Mo(132)}-type Keplerate.
  • To isolate and characterize a novel polyanion formed during the degradation process.
  • To elucidate the role of copper(II) complexes in directing the formation of the new structure.

Main Methods:

  • Chemical degradation of an {Mo(132)}-type Keplerate using [Cu(MeCN)(4)](PF(6)) in acetonitrile.
  • Isolation and characterization of the resulting polyanion, [Mo(12)O(46)(PF)(4)](4-).
  • Structural analysis using Phosphorus-31 Nuclear Magnetic Resonance ((31)P-NMR) spectroscopy.

Main Results:

  • Isolation of an unusual PFO(3)(2-)-templated "inverse Keggin" polyanion, [Mo(12)O(46)(PF)(4)](4-).
  • The inverse Keggin structure represents a novel topological motif in polyoxometalate chemistry.
  • (31)P-NMR studies indicate that the copper(II) complex, [Cu(MeCN)(4)](+), acts as a structure-directing agent.

Conclusions:

  • The degradation of {Mo(132)}-type Keplerates can yield unexpected and complex polyanionic structures.
  • The use of metal complexes, such as copper(II), offers a promising strategy for templating novel POM architectures.
  • This discovery expands the known structural diversity of polyoxometalates and highlights new synthetic possibilities.