Deactivation of poly(o-aminophenol) after its interaction with ferric cations. Effects on the protonation reaction and electron transport

D. SCOLARI; R. TUCCERI

The Open Physical Chemistry Journal

Bentham Science Publishers (http://benthamscience.com/open/topcj/openaccess2.htm).

Lugar: Sharjah, U.A.E.; Año: 2010 vol. 4 p. 78 - 83

1874-0677

The aim of this work was to demonstrate that interaction of ferric cations with poly(oaminophenol)(POAP) films causes their deactivation. Spectroelectrochemical measurementsand rotating disk electrode voltammetry (RDEV) were employed on both freshly prepared anddeactivated POAP films. It was observed a reduction (deactivation) of the redox activity ofPOAP after its treatment with ferric cations. A degree of deactivation of POAP was defined onthe basis of the reduction of the voltammetric charge after its interaction with a ferric cationsolution. With regard to spectroelectrochemical measurements, absorbance as a function ofboth wavelength and electrode potential, seem to demonstrate that redox sites of a deactivatedPOAP film are less protonated than redox sites of a freshly prepared film. RDEVmeasurements indicate the existence of a slower electron transport in a POAP film treated witha ferric cation solution, as compared with the electron transport in a non-deactivated film.