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Enclosing classical polyoxometallates in silver nanoclusters.

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Researchers report novel silver-thiolate clusters encapsulating polyoxometallates (POMs), including Lindqvist-Mo6O192- and V10O286-. These clusters form unique extended structures, offering new possibilities in materials science.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Polyoxometallates (POMs) present challenges in predictable assembly with silver clusters due to structural modifications upon encapsulation.
  • Understanding the interplay between POMs and silver clusters is crucial for designing novel materials.

Purpose of the Study:

  • To synthesize and characterize novel high-nuclearity silver-thiolate clusters encapsulating classical POMs.
  • To explore the structural diversity and extended framework formation of these POM-silver cluster hybrids.
  • To investigate the symmetry transfer from encapsulated POMs to silver clusters.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Synthesis of silver-thiolate clusters with Lindqvist-Mo6O192- and V10O286- anions.
  • Analysis of extended structures including 1D chains, 2D layers, and 3D frameworks.

Main Results:

  • Three novel clusters were identified: [(V10O28)@Ag44] (SD/Ag44a), [(V10O28)@Ag46] (SD/Ag46), and [(Mo6O19)@Ag44] (SD/Ag44b).
  • These clusters extended into 1D, 2D, and 3D frameworks.
  • SD/Ag44b exhibits a unique pseudo-sodalite structure with a core-shell cluster, demonstrating symmetry transfer from the Mo6O192- guest to the Ag44 host.

Conclusions:

  • A new family of silver cluster compounds encapsulating classical POMs has been discovered.
  • The encapsulation of POMs can lead to novel extended structures with potential applications in materials science.
  • The observed symmetry delivery from POMs to silver clusters provides insights into host-guest interactions.