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Shape-persistent octanuclear zinc salen clusters: synthesis, characterization, and catalysis.

Robert M Haak1, Antonello Decortes, Eduardo C Escudero-Adán

  • 1Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain.

Inorganic Chemistry
|August 3, 2011
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We synthesized stable Zn(8) metal clusters using a bis-nucleating salen ligand. These shape-persistent clusters show catalytic activity in organic carbonate synthesis, dependent on their exterior structure.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Catalysis

Background:

  • Salen ligands are versatile scaffolds for metal complex synthesis.
  • Template-controlled synthesis offers precise control over cluster architecture.
  • Metal clusters can exhibit unique catalytic properties.

Purpose of the Study:

  • To develop a selective and template-controlled synthesis of Zn(8) metal complexes.
  • To investigate the structural and catalytic properties of the synthesized clusters.
  • To understand the influence of the cluster's exterior on its catalytic activity.

Main Methods:

  • Selective and template-controlled synthesis utilizing a bis-nucleating salen ligand.
  • X-ray crystallography for structural elucidation.
  • Solution studies including NMR (1H, 13C DEPTQ, DOSY), GPC, HPLC, and mass spectrometry for characterization and stability assessment.

Main Results:

  • High-yield preparation of discrete, shape-persistent Zn(8) metal clusters.
  • Demonstration of catalytic activity in organic carbonate synthesis.
  • Correlation of catalytic activity with the nature of the exterior metal-connecting fragment.
  • Confirmation of high cluster stability through various analytical techniques.

Conclusions:

  • The developed synthetic strategy enables the efficient production of stable, well-defined Zn(8) metal clusters.
  • The catalytic performance of these clusters in organic carbonate synthesis is tunable via modification of the exterior fragment.
  • These findings contribute to the design of novel metal cluster catalysts with tailored properties.