Spectroelectrochemistry and investigation of charge transport mechanisms of iron poly(pyridyl) redox polymers

In this work, we describe the characterization of the complex [Fe(tpy-NH2)2](PF6)2 (tpy-NH2 = bis[4′-(3-aminophenyl)-2, 2′:6′,2″-terpyridine]. The complex was oxidatively electropolymerized on glassy-carbon electrodes in CH3CN/0.1 M tetraethylammonium perchlorate (TEAP) to generate polymer films that exhibit reversible oxidative electrochemical behavior in a wide potential range (0.0–1.6 V), as well as high conductivity and stability/durability. In situ spectrocyclic voltammetry of this modified electrode was carried out on a photodiode array spectrophotometer attached to a potentiostat, which provided UV–Vis absorption spectra of the redox species during the potential sweep. We determined charge transport parameters as a function of time and thickness of the modified electrode, and the results showed that poly-[[Fe(tpy-NH2)2]2+]n can be made to exhibit three regimes of charge transport behavior by manipulation of the film thickness and the experimental time-scale. Morphological characterization of the film was provided by atomic force microscopy.

In this work, we describe the characterization of the complex [Fe(tpy-NH2)2](PF6)2 (tpy-NH2 = bis[4′-(3-aminophenyl)-2,2′:6′,2″-terpyridine] and report the electropolymerization and charge transport parameters. The results showed that poly-[[Fe(tpy-NH2)2]2+]n can exhibit three regimes of charge transport as a function of film thickness and polymerization time. Morphological characterization was provided by atomic force microscopy.Figure optionsDownload as PowerPoint slide