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Dynamic Aggregation Triggering Reversible Spin-State Switching.

Yang-Hui Luo1, Xue-Ting Jin1, Shu-Xin Zhang1

  • 1School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China.

ACS Applied Materials & Interfaces
|October 4, 2023
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Summary
This summary is machine-generated.

This study demonstrates reversible spin-state switching (SSS) in a ferrous complex by controlling its aggregation state. The complex, integrated into a sponge, shows potential for developing smart molecular switches for all-weather humidity capture.

Keywords:
NIR-sensitivecharge transferdynamic aggregationferrous complexspin-state switching

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Coordination Chemistry

Background:

  • Spin-state switching (SSS) is crucial for molecular switches.
  • Controlling SSS under ambient conditions remains a challenge.
  • Aggregation state influences the properties of ferrous complexes.

Purpose of the Study:

  • To demonstrate reversible SSS mediated by aggregation state in a near-infrared (NIR)-sensitive ferrous complex.
  • To explore the potential of this complex in a functional device for smart molecular switching.

Main Methods:

  • Synthesis and characterization of a NIR-sensitive ferrous complex.
  • Investigation of aggregation-dependent spin states (low-spin and high-spin) in solution.
  • Incorporation of the complex into a hygroscopic sponge.
  • Evaluation of reversible SSS triggered by humidity and NIR irradiation.

Main Results:

  • The ferrous complex exhibits J-aggregation and a low-spin state in DMF suspension.
  • Addition of water induces H-aggregation and a high-spin state via enhanced charge transfer.
  • NIR irradiation restores J-aggregation and the low-spin state through ligand-to-ligand charge transfer.
  • The sponge-integrated complex shows reversible SSS upon alternating humidity capture and NIR irradiation.

Conclusions:

  • Reversible spin-state switching can be effectively controlled by the aggregation state of ferrous complexes.
  • The developed ferrous complex, integrated into a sponge, functions as a smart molecular switch for ambient humidity capture.
  • This work presents a novel approach for designing advanced molecular switches at the device level.