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1.4 CHEMICAL SCIENCES
New ferrocene derivatives, ((4-(1H-pyrrol-1-yl)phenoxy)carbonyl) ferrocene (4) and (6-(4-(1H-pyrrol-1-yl)phenoxy)hexyl) ferrocene (7) were synthesised, characterised and electrochemically evaluated as redox active films formed via anodic oxidation with pyrrole. Thin film studies were conducted and films formed from both compounds resulted in a stable Fe II/III redox couple with Eo = 0.04V and 0.36V vs. Ag/Ag+ for (7) and (4) respectively. Both potential sweeping and chronocoulometry were employed for film formation with the former resulting in controllable, reproducible film deposition. Growth conditions and solution concentrations were varied in the case of both compounds in order to assess influence on electrochemical behavior. Surface coverage’s were of the order 10-8-10-9 mol cm-2, surface confined behavior (ip vs. n) was evident up to 0.2 V s-1 with semi-infinite diffusion (ip vs. n1/2) dominating at higher scan rates. Laviron theory was employed where possible for the determination of electron transfer co-efficient and rate constants.
Hong Soon, G., Deasy, M. & Worsfold, O. (2011). Synthesis, co-polymerisation and electrochemical evaluation of novel ferrocene-pyrrole derivatives. Analytical Letters, vol. 44, no. 11. doi:10.1080/00032719.2010.539729