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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Catalysis

Background:

  • Predictive synthesis of polynuclear oxo clusters is a significant challenge in inorganic chemistry.
  • Transition metal {M4O4} cubanes are of interest as molecular water oxidation catalysts, mimicking natural systems like photosystem II.

Purpose of the Study:

  • To introduce a novel strategy for synthetic control over {M4O4} cubanes using counteranions.
  • To demonstrate the structure-directing effect of counteranions on oxo cluster self-assembly.
  • To explore the water oxidation activity of synthesized cubanes.

Main Methods:

  • Utilized a selective counteranion toolbox for controlled assembly of di(2-pyridyl) ketone (dpk) with M(OAc)2 precursors (M = Co, Ni).
  • Employed systematic mechanistic experiments and computational studies (DFT) to elucidate formation pathways.
  • Assessed visible-light-driven water oxidation activity of type 1 and type 2 cubanes.

Main Results:

  • Demonstrated selective synthesis of type 1 and type 2 {M4O4} cubanes by varying counteranions (e.g., perchlorate for type 2).
  • Identified key dimeric building blocks and pathways for type 1 and type 2 cubane formation.
  • Showcased the synthesis of Co/Ni-mixed and {Ni4O4} cubanes using Ni(OAc)2 precursor.

Conclusions:

  • Counteranions play a crucial role in directing the self-assembly of oxo clusters.
  • This ionic control strategy provides rapid access to tunable molecular materials for catalysis.
  • The findings pave the way for efficient design concepts in coordination chemistry and materials science.