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Sho Kuwajima1, Yuji Kikukawa1,2, Yoshihito Hayashi1

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Chemistry, an Asian Journal
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Summary

Dodeca-vanadate, a bowl-shaped inorganic host, forms complexes with various anions. The host

Keywords:
anionshost-guest systemspolyoxometalatesstructure elucidationvanadium

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Area of Science:

  • Inorganic chemistry
  • Supramolecular chemistry
  • Materials science

Background:

  • Dodeca-vanadate ([V12O32]4-) is an inorganic bowl-type host molecule.
  • Its cavity entrance has a diameter of 4.4 Å.
  • Host-guest chemistry explores the interactions between host molecules and guest species.

Purpose of the Study:

  • To investigate the formation of host-guest complexes with dodeca-vanadate.
  • To characterize the structural and dynamic properties of these complexes.
  • To understand the influence of guest anion properties on complex formation and stability.

Main Methods:

  • X-ray crystallographic analyses to confirm complex structures.
  • 51V NMR spectroscopy to study host-guest interactions and dynamics.
  • Synthesis and characterization of dodeca-vanadate complexes with various anions.

Main Results:

  • Formation of host-guest complexes [V12O32(X)]5- with linear, bent, and trigonal planar anions (CN-, OCN-, NO2-, NO3-, HCO2-, CH3CO2-).
  • Guest anion type influences the distortion of the dodeca-vanadate bowl shape.
  • 51V NMR spectroscopy shows distinct chemical shift changes upon guest incorporation.
  • Incorporation rates vary significantly based on anion structure; nonspherical anions incorporate faster than spherical halides.
  • Nonspherical anions are easily dissociated/exchanged, while halides remain stable within the host.

Conclusions:

  • Dodeca-vanadate effectively complexes with a range of anions.
  • The host-guest interactions are sensitive to the geometry and charge distribution of the guest anion.
  • The stability and dynamics of incorporated anions differ based on their structure, offering potential for selective anion binding and release.