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A spin-crossover framework endowed with pore-adjustable behavior by slow structural dynamics.

Jin-Peng Xue1, Yang Hu1, Bo Zhao1

  • 1Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 102488, People's Republic of China.

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This study introduces a novel 2D porous magnetic material that dynamically changes pore size and structure upon water adsorption. This transformation is linked to a spin crossover property, enabling programmable adsorption control in dynamic frameworks.

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Host-guest interactions are key for switchable porous materials, but control remains difficult.
  • Dynamic frameworks offer tunable structures and functionalities through responsive interactions.

Purpose of the Study:

  • To report a novel 2D porous magnetic compound with switchable pore structures.
  • To investigate the relationship between water adsorption, pore transformation, and spin state transitions.

Main Methods:

  • Synthesis of a 2D porous magnetic compound [FeII(prentrz)2PdII(CN)4].
  • Characterization of adsorption-induced pore transformation (narrow quasi-discrete pore to large channel-type pore).
  • Analysis of the accompanying spin crossover (SCO) property variations.

Main Results:

  • The material exhibits an atypical, adsorption-induced pore transformation coupled with a spin state transition.
  • Water adsorption triggers ligand motion and layer crumpling, leading to reversible pore rearrangement.
  • The pore transformation influences the spin crossover behavior, showing distinct SCO properties for different pore phases.

Conclusions:

  • The discovered material demonstrates a unique mechanism for controlling pore structure and physical properties via adsorption.
  • This work provides insights into designing dynamic frameworks with programmable adsorption and tunable functionalities.
  • The interplay between pore dynamics and spin crossover opens new avenues for responsive materials.