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A Proton Conducting Cobalt(II) Spin Crossover Complex.

Dong Shao1, Jiong Yang1, Xiao-Qin Wei2

  • 1Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, 438000, Huanggang, P. R. China.

Chemistry, an Asian Journal
|October 17, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel cobalt complex exhibiting spin crossover (SCO) behavior and proton conductivity. This bifunctional material demonstrates potential for advanced molecular magnetic and electronic applications.

Keywords:
Cobalt(II)Mononuclear complexMultifunctional materialsProton conductionSpin crossover

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Area of Science:

  • Materials Science
  • Coordination Chemistry
  • Supramolecular Chemistry

Background:

  • Spin crossover (SCO) complexes are bistable materials with potential in molecular magnetism.
  • SCO complexes are increasingly used as building blocks for multifunctional molecular magnetic materials.

Purpose of the Study:

  • To synthesize and characterize a new mononuclear cobalt complex.
  • To investigate the spin crossover properties and proton conductivity of the synthesized complex.
  • To explore the potential of this complex as a bifunctional molecular conductor.

Main Methods:

  • Synthesis of a mononuclear cobalt complex using a halogen-functionalized terpyridine derivative and organosulfonate.
  • Magnetic measurements to observe spin transitions.
  • Dynamic crystallographic experiments to confirm SCO behavior.
  • Electrical conductivity measurements to assess proton conductivity.

Main Results:

  • A complete and gradual spin transition was observed for Co²⁺ ions at T₁/₂ = 200 K.
  • Significant room temperature proton conductivity (6.9 × 10⁻⁵ S cm⁻¹) was achieved under 98% relative humidity.
  • The proton conductivity is attributed to sulfonate-assisted hydrogen-bonded proton hopping pathways.

Conclusions:

  • An unprecedented proton-conducting cobalt(II) SCO complex has been developed.
  • This work offers a promising strategy for designing bifunctional SCO molecular conductors.
  • The integration of SCO transition and proton conduction opens new avenues for molecular electronic devices.