Multistable molecular chain magnet in electrospun polymer fibers

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Coordination compounds exhibit switchable properties triggered by external stimuli.
• Incorporating brittle coordination compounds into polymer matrices can improve mechanical stability.
• Developing materials with multi-responsive characteristics is crucial for advanced applications.

Purpose of the Study:

• To create novel composite materials with multi-switchable thermochromic and vapochromic properties.
• To enhance the mechanical properties and water resistance of a coordination compound.
• To investigate the influence of polymer matrices on the coordination compound's switchable behavior.

Main Methods:

• Electrospinning of poly(ε-caprolactone) (PCL) or poly(2-vinylpyridine-co-styrene) (P2VP-PS) fibers.
• Incorporation of {NH4[Ni(cyclam)][Fe(CN)6]·5H2O}n coordination compound into polymer fibers.
• Characterization using SEM, TEM, XAS, Raman spectroscopy, PXRD, DVS, and magnetic measurements.

Main Results:

• Successful fabrication of composite mats with switchable thermochromic and vapochromic properties.
• Demonstration of reversible metal-to-metal charge transfer triggered by temperature, humidity, or pressure.
• PCL matrix provided excellent water protection and improved mechanical properties compared to the bare coordination compound.

Conclusions:

• Composite materials combining coordination chains and PCL offer enhanced mechanical stability and water resistance.
• The developed materials exhibit multi-switchable properties useful for sensor applications.
• Polymer matrix selection significantly influences the performance and durability of the functional coordination compound.