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Changing the oxothiomolybdate ring from an anionic to a cationic receptor.

Jean-François Lemonnier1, Sébastien Floquet, Jérôme Marrot

  • 1Institut Lavoisier de Versailles, Université de Versailles Saint Quentin, UMR 8180, 45 avenue des Etats Unis, 78035 Versailles, France.

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Neutral oxothiomolybdenum wheels exhibit tunable ionic recognition properties. Ionization of aquo ligands transforms anionic wheels to cationic, enabling supramolecular host-guest interactions with cesium cations in solid and solution states.

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Area of Science:

  • Inorganic Chemistry
  • Supramolecular Chemistry
  • Coordination Chemistry

Background:

  • Oxothiomolybdenum clusters represent a unique class of inorganic compounds.
  • Understanding their ionic recognition capabilities is crucial for designing novel materials.
  • The influence of ligand ionization on cluster properties is an active area of research.

Purpose of the Study:

  • To investigate the impact of aquo ligand ionization on the ionic recognition of oxothiomolybdenum wheels.
  • To explore the formation of supramolecular host-guest complexes involving these clusters.
  • To characterize the stability of these interactions in both solid and solution phases.

Main Methods:

  • Synthesis and characterization of oxothiomolybdenum wheel compounds.
  • Crystallographic analysis to determine solid-state structures and interactions.
  • Spectroscopic and solution-based techniques to study labile associations.

Main Results:

  • Demonstrated that ionization of internal aquo ligands switches the ionic recognition from anionic to cationic.
  • Observed a close supramolecular host-guest arrangement between [Mo8O8S8(OH)10(H2O)]2- and Cs+ cations in the solid state.
  • Found evidence that these host-guest interactions persist as labile associations in solution.

Conclusions:

  • The ionic recognition properties of oxothiomolybdenum wheels are tunable via ligand ionization.
  • These clusters can act as hosts for cations, forming stable supramolecular assemblies.
  • The observed host-guest interactions are adaptable between solid and solution environments.