Electropolymerized Films of Macromeric Assemblies

Area of Science:

• Electrochemistry
• Polymer Science
• Materials Science
• Photochemistry

Background:

• Ruthenium(II) bipyridine complexes are widely studied for their photophysical and electrochemical properties.
• Polymer-supported metal complexes offer advantages in device fabrication and stability.
• Living anionic polymerization provides precise control over polymer architecture.

Purpose of the Study:

• To synthesize and characterize a novel macromer based on poly[4-(2-aminoethyl)styrene] and a ruthenium(II) bipyridine complex.
• To investigate the electropolymerization behavior and film properties of the synthesized macromer.
• To compare the electrochemical and photophysical properties of macromeric films with conventional polymer films.

Main Methods:

• Synthesis of poly[4-(2-aminoethyl)styrene] via living anionic polymerization.
• Derivatization of the polymer with [Ru(II)(vbpy)(2)(4-CO(2)H-4 ombin-CH(3)bpy)](2+) via amide coupling.
• Reductive electropolymerization of the macromer onto various electrode materials.
• Characterization of film morphology, charge transfer, and excited state lifetimes.

Main Results:

• Macromeric films displayed significantly rougher, locally microporous structures compared to conventional films.
• Intrafilm charge transfer rates in macromeric films were comparable to conventional films.
• Metal-to-ligand charge transfer (MLCT) excited state lifetimes were shortened in macromeric films, attributed to quenching by trap sites.

Conclusions:

• The synthesized macromer can be effectively electropolymerized to form stable films with unique structural properties.
• The macromeric films exhibit distinct photophysical characteristics, including shorter excited state lifetimes, due to their structure.
• Sequential polymerization allows for the preparation of stable mixed-polymer films with tunable properties.