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Constructing spin crossover-fluorescence bifunctional iron(II) complexes based on tetraphenyl ethylene-decorated
Cheng Yi1, Shi-Hui Zhang1, Liang Zhao1
1State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. liutao@dlut.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|March 24, 2023
Summary
This study presents novel bifunctional materials combining spin crossover (SCO) and aggregation-induced emission (AIE) properties. The synthesized iron(II) complexes exhibit tunable SCO transitions and retained fluorescence in the solid state.
Area of Science:
- Materials Science
- Coordination Chemistry
- Supramolecular Chemistry
Background:
- Spin crossover (SCO) and aggregation-induced emission (AIE) are crucial properties for advanced functional materials.
- Simultaneously achieving SCO and AIE in solid-state materials remains a significant challenge.
- Designing bifunctional ligands is key to overcoming these limitations.
Purpose of the Study:
- To design and synthesize novel SCO-fluorescence bifunctional materials.
- To investigate the structure-property relationships of iron(II) complexes with a designed AIE-SCO ligand.
- To explore the simultaneous SCO and AIE behavior in the solid state.
Main Methods:
- Synthesis of a novel ligand (E)-2,6-bis(1H-pyrazol-1-yl)-4-(4-(1,2,2-triphenylvinyl)styryl)pyridine (tpe-bpp).
- Coordination of the ligand with Fe(II) salts to form mononuclear complexes.
- Single-crystal X-ray diffraction for structural analysis.
- Magnetic susceptibility measurements to study SCO behavior.
- Fluorescence spectroscopy to investigate AIE properties and temperature-dependent photoluminescence.
Main Results:
- Three new mononuclear iron(II) complexes with the tpe-bpp ligand were synthesized and characterized.
- All complexes exhibited complete SCO behavior with varying transition temperatures (375 K, 260 K, 248 K).
- The ligand and its iron(II) complexes demonstrated aggregation-induced emission (AIE) properties.
- A monotonic decrease in photoluminescence intensity with increasing temperature was observed for all complexes.
Conclusions:
- The designed tpe-bpp ligand successfully integrates SCO and AIE functionalities in iron(II) complexes.
- The study establishes a viable strategy for creating solid-state bifunctional materials.
- These findings open avenues for developing new materials for sensing and molecular switches.
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