Mediator and catalytic effects of porphyrin modified electrodes on redox LB films

• Published in: Electrochimica acta Vol. 51; no. 18; pp. 3714 - 3718
• Main Authors: Pérez-Morales, Marta, Martín-Romero, María T., Muñoz, Eulogia, Camacho, Luis
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 05.05.2006; Elsevier
• Subjects: Azobenzene; Chemistry; Electrochemistry; Exact sciences and technology; General and physical chemistry; Kinetics and mechanism of reactions; Langmuir–Blodgett; Modified electrodes; Ni-porphyrin; Viologen; Langmuir–Blodgett; Modified electrodes; Viologen; Ni-porphyrin; Azobenzene; Kinetic control; Oxidation reduction; Catalytic reaction; Indium tin oxide electrode; Nickel Complexes; Iminium compounds; Organic ligand; Transition metal Complexes; Experimental study; Langmuir Blodgett method; Langmuir-Blodgett; Cyclic voltammetry; Azo compound; Electrode reaction; Metalloporphyrin; Electrochemical reaction; Catalyst activity; Organic dication; Modified material
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2005.10.027

In this work, the mediator and/or catalytic properties of modified ITO electrodes by oxidative electrodeposition of Ni-porphyrins have been analyzed. Thus, monolayers containing viologen or azobenzene derivatives, have been transferred onto the porphyrin modified electrodes by using the Langmuir–Blodgett (LB) technique. Following, the redox processes of these compounds forming the LB films and deposited on the modified electrode and the bare ITO have been investigated. The obtained results reveal not only the excellent mediator character of the porphyrinic electrodeposit throughout the viologen redox processes, but also its the catalytic action over the azobenzene kinetics. Specifically, for the last case, the NiTMPyP films accelerate the azobenzene kinetics up to 100 times with respect to those results obtained in absence of porphyrin.