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β-Diketonate-bearing half-paddlewheel-type diruthenium(II,II) naphthyridine complexes with well-defined Ru-Ru double bonds.

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Paddlewheel-type and half-paddlewheel-type diruthenium(II,II) complexes with 1,8-naphthyridine-2-carboxylate.

Yusuke Kataoka1, Nozomi Tada1, Naoki Masamori1

  • 1Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060, Nishikawatsu, Matsue, Shimane, 690-8504, Japan. kataoka@riko.shimane-u.ac.jp.

Dalton Transactions (Cambridge, England : 2003)
|January 16, 2025
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Summary

Researchers developed air-stable paddlewheel diruthenium complexes using electron-withdrawing ligands. These paramagnetic complexes exhibit unique structures and magnetic properties, paving the way for advanced materials.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Paddlewheel-type diruthenium(II,II) complexes are paramagnetic (S = 1) building blocks for advanced materials.
  • These complexes are typically air-sensitive, limiting their practical applications.
  • Electron-withdrawing ligands can enhance stability and tune electronic properties.

Purpose of the Study:

  • To develop an air-stable paddlewheel-type diruthenium(II,II) complex.
  • To investigate the structural, magnetic, and electrochemical properties of the new complexes.
  • To explore the tunability of the complex structure by ligand exchange.

Main Methods:

  • Synthesis of diruthenium complexes with 1,8-naphthyridine-2-carboxylate (npc) ligands.
  • Characterization using X-ray diffraction, NMR, MS, and elemental analysis.
  • Magnetic susceptibility measurements and cyclic voltammetry (CV).

Main Results:

  • An air-stable complex [Ru₂(μ-npc)₂(O₂CMe)₂] (1) was synthesized.
  • Heteroleptic (2) and homoleptic (3) complexes were formed via ligand exchange.
  • Complexes 1-3 exhibited conventional or half-paddlewheel structures with S = 1, large zero-field splittings, and reversible redox behavior.
  • Intense MLCT absorption bands were observed between 500-800 nm.

Conclusions:

  • The developed diruthenium complexes are air-stable and possess tunable structures.
  • The complexes exhibit significant magnetic anisotropy and interesting electronic properties.
  • These findings offer new possibilities for designing functional diruthenium-based materials.