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Modulating multi-channel bistability in cyanide-bridged {Fe2Fe} spin-crossover coordination polymers
Xin-Feng Li1, Hao Wang1, Du-Yong Chen1
1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, China. mengys@dlut.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|January 27, 2026
Summary
Researchers developed a ligand-modulation strategy for multi-channel bistable materials. This approach enables tunable, stepwise spin-crossover transitions with thermal hysteresis for advanced smart devices.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Coordination Chemistry
Background:
- Multi-channel bistable materials are crucial for information encryption and smart devices.
- Achieving tunable transitions and significant thermal hysteresis simultaneously is a major challenge.
Purpose of the Study:
- To develop a molecular-level strategy for controllable, stepwise spin-crossover (SCO) transitions with thermal hysteresis.
- To demonstrate multi-channel modulation in optical, magnetic, and electronic properties.
Main Methods:
- Ligand-modulation strategy using subtle substituent modifications to tune intermolecular interactions.
- Synthesis and characterization of two iron coordination compounds ({[(Tp)FeIII(CN)3][FeII0.5(L1)]} (1) and {[(Tp)FeIII(CN)3][FeII0.5(L2)]} (2)).
- Investigation of spin-crossover transitions and thermal hysteresis using optical absorption and dielectric measurements.
Main Results:
- A controllable transformation from a one-step SCO transition in compound 1 to a two-step transition in compound 2 was achieved.
- The stepwise transitions in compound 2 were accompanied by pronounced thermal hysteresis.
- Cooperative multistate modulation was observed across photonic, magnetic, and electronic channels.
Conclusions:
- The ligand-modulation strategy provides a viable molecular approach for realizing tunable stepwise transitions with thermally hysteretic behavior.
- This work paves the way for next-generation multifunctional switchable materials and devices with enhanced functionalities.
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