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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Metal-organic frameworks (MOFs) offer tunable porosity and lattice properties, unlike rigid inorganic materials.
  • Redox-active MOFs exhibit dynamic guest interactions that can modulate electronic and magnetic properties.
  • Porous magnets leverage framework, space, and electronic state coupling for stimulus-responsive applications.

Purpose of the Study:

  • To develop redox-active MOF magnets using donor-acceptor (D/A) architectures.
  • To investigate guest-induced electronic and magnetic phase switching in these MOFs.
  • To establish design principles for MOFs poised at electronic instability.

Main Methods:

  • Integration of redox-active diruthenium(II,II) complexes (donors) with π-acidic TCNQ derivatives (acceptors).
  • Formation of layered D2A frameworks enabling closely spaced electronic states.
  • Exploration of on-host charge transfer (CT) and host-guest CT mechanisms for magnetic switching.

Main Results:

  • Discovery of five representative D/A-MOF systems exhibiting guest-induced on-host CT.
  • Demonstration that subtle guest adsorption can trigger charge transfer and reorganize magnetic ground states.
  • Identification of on-host CT as a viable mechanism, exploiting donor-acceptor energetic competition.

Conclusions:

  • Rational design of D/A-MOFs can achieve electronic instability for external stimuli-responsive behavior.
  • Donor-acceptor positioning and targeting emergent electronic configurations are key design strategies.
  • These multifunctional MOFs offer a versatile platform for information storage and chemical sensing.