Abstract

This study explores two Fe(II) spin-crossover (SCO) complexes; mononuclear ionic [Fe(LC12)3](BF4)2] (Fe-mono) and dinuclear molecular [Fe2(CH3COO)4(LC12)2] (Fe-dinuc), focusing on the effects of adding polymethylmethacrylate (PMMA) on the thin films properties. PMMA improved film morphology, with Fe-dinuc/PMMA composites showing more uniform surfaces due to better miscibility. Optical analysis revealed that both complexes undergo gradual high-spin (HS) to low-spin (LS) transitions, with PMMA reducing the optical bandgap through enhanced molecular packing. Fe-dinuc/PMMA composites showed higher capacitance, higher voltage response sensitivity (3.44 µV K−1), and strong memory effects, making them suitable for thermal charge capacitors, switching, and memory devices. These findings highlight PMMA-enhanced SCO thin films for advanced electronic applications.

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