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Electrochemical and Spectroelectrochemical Properties of a New Donor–Acceptor Polymer Containing 3,4-Dialkoxythiophene and 2,1,3-Benzothiadiazole Units

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Author(s): Erika Herrera Calderon | Milind Dangate | Norberto Manfredi | Alessandro Abbotto | Matteo M. Salamone | Riccardo Ruffo | Claudio M. Mari

Journal: Polymers
ISSN 2073-4360

Volume: 5;
Issue: 3;
Start page: 1068;
Date: 2013;
Original page

Keywords: donor–acceptor–donor monomer | conducting polymer | electropolymerization | electrochemistry | 3 | 4-bis(2-ethylhexyloxy)thiophene | 2 | 1 | 3-benzothiadiazole

ABSTRACT
A new heteroarylene-vinylene donor-acceptor low bandgap polymer, the poly(DEHT-V-BTD), containing vinylene-spaced efficient donor (dialkoxythiophene) and acceptor (benzothiadiazole) moieties, is presented. Electropolymerization has been carried out by several electrochemical techniques and the results are compared. In particular, the pulsed potentiostatic method was able to provide layers with sufficient amounts of material. Cyclic voltammetries showed reversible behavior towards both p- and n-doping. The HOMO, LUMO, and bandgap energies were estimated to be −5.3, −3.6 and 1.8 eV, respectively. In situ UV-Vis measurements have established that the presence of the vinylene group stabilizes the formation of polaronic charge carriers even at high doping levels.
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