Research in the field of conducting organic polymers is currently attracting increasing attention, since these innovative smart materials are very promising for applications in different fields, from energetics to electronics and sensoristics. We have devoted special interest to the study of thiophene-based materials, paying attention, in particular, to the relationships between chemical structure and electronic properties [1,2]. Relevant results in this field can be successfully achieved with a systematic characterization of the materials through a combination of voltammetric and electrochemical impedance spectroscopy (EIS) techniques. EIS, in particular, is fundamental for clarifying the conductive behavior, both electronic and ionic, of films of electroactive materials. In this frame, we are developing a systematic investigation of the role played by different experimental parameters on the charge transport mechanism in polythiophene-based systems, using the cyclopentadithiophene (CPDT) as the model monomer (see figure). There are two main reasons for this choice: CPDT molecule is planar and electronic conjugation is, by consequence, higher than that displayed by analogous compounds based on 2,2’-bithiophene. Furthermore, the C2v symmetry makes homotopic the two thiophene α-positions in CPDT, in the olygomers and in the polymers, thus assuring a full regioregularity to the materials resulting from the electroxidation process. The results of the EIS investigation on poly-CPDT will be presented, focusing attention in particular onto the effects of i) an increasing thickness of the film, ii) of the different applied potentials and iii) of the addition of redox mediators (ferrocene and decamethylferrocene) to the working medium. Moreover a combined voltammetric and EIS study applied to a very interesting and promising inherently chiral polymer will be shown.  T. Benincori, M. Capaccio, F. De Angelis, L. Falciola, M. Muccini, P.Mussini, A. Ponti, S. Toffanin, P. Traldi, F. Sannicolò. Chem. Eur. J. (2008) 14, 459.  T.Benincori, V. Bonometti, F. De Angelis, L. Falciola, M. Muccini, P. R. Mussini, T. Pilati, G. Rampinini, S. Rizzo, S. Toffanin, F. Sannicolò, Chem. Eur. J. (2010) 16, 9086.
4H-cycloPenta[3,2-b]dithiophene (CPDT) : a useful model for the study of conducting polymers via electrochemical impedance spectroscopy / F. Sannicolò, P.R. Mussini, M. Magni. ((Intervento presentato al convegno Giornate dell’Elettrochimica Italiana tenutosi a Pavia nel 2013.
|Titolo:||4H-cycloPenta[3,2-b]dithiophene (CPDT) : a useful model for the study of conducting polymers via electrochemical impedance spectroscopy|
|Data di pubblicazione:||set-2013|
|Parole Chiave:||conducting organic polymer ; electrochemical impedance spectroscopy|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
Settore CHIM/06 - Chimica Organica
|Enti collegati al convegno:||Società Chimica Italiana|
|Citazione:||4H-cycloPenta[3,2-b]dithiophene (CPDT) : a useful model for the study of conducting polymers via electrochemical impedance spectroscopy / F. Sannicolò, P.R. Mussini, M. Magni. ((Intervento presentato al convegno Giornate dell’Elettrochimica Italiana tenutosi a Pavia nel 2013.|
|Appare nelle tipologie:||14 - Intervento a convegno non pubblicato|