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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate
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Structurally characterized terminal manganese(iv) oxo tris(alkoxide) complex.

Robert L Halbach1, David Gygi1, Eric D Bloch1

  • 1Department of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , USA .

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|June 14, 2018
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Summary

A novel manganese(IV) complex with a terminal oxo ligand was synthesized and characterized. This complex models the manganese center in photosystem II and demonstrates C-H bond activation via hydrogen atom abstraction.

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Area of Science:

  • Inorganic Chemistry
  • Bioinorganic Chemistry
  • Photochemistry

Background:

  • The oxygen evolving complex in photosystem II contains a unique manganese cluster crucial for water oxidation.
  • Understanding the electronic and structural properties of manganese complexes is key to mimicking biological processes.

Purpose of the Study:

  • To synthesize and characterize a novel manganese(IV) complex with a terminal oxo ligand.
  • To investigate the C-H bond activation capabilities of the synthesized complex.
  • To establish a model for the manganese active site in photosystem II.

Main Methods:

  • Synthesis of [MnIV(O)(ditox)3][K(15-C-5)2] from its Mn(II) precursor.
  • X-ray crystallography for structural determination.
  • Electron Paramagnetic Resonance (EPR) spectroscopy, SQUID magnetometry, and Evans method for magnetic characterization.

Main Results:

  • Isolation and structural characterization of the pseudotetrahedral [MnIV(O)(ditox)3][K(15-C-5)2] complex.
  • Confirmation of a high-spin S = 3/2 Mn(IV) metal center.
  • Demonstration of C-H bond activation through hydrogen atom abstraction.

Conclusions:

  • The synthesized Mn(IV)-oxo complex serves as a valuable model for the oxygen evolving complex in photosystem II.
  • The complex exhibits reactivity relevant to biological systems, specifically C-H bond activation.
  • Structural and electronic properties align with proposed mechanisms in photosynthetic water oxidation.