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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electrochemical synthesis of the copolymer poly(2-methoxy-5-bromo-p-phenylenevinylene)/(2,5-dicyano-p-phenylenevinylene) (MB-PPV/DCN-PPV): tuning properties

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Author(s):
Karine C. C. W. S. Klider [1] ; Fábio S. Santos [2] ; Laura O. Péres [3] ; Karen Wohnrath [4] ; Jarem R. Garcia [5]
Total Authors: 5
Affiliation:
[1] State University of Ponta Grossa (UEPG). Chemistry Department - Brasil
[2] State University of Ponta Grossa (UEPG). Chemistry Department - Brasil
[3] Federal University of São Paulo (UNIFESP) - Brasil
[4] State University of Ponta Grossa (UEPG). Chemistry Department - Brasil
[5] State University of Ponta Grossa (UEPG). Chemistry Department - Brasil
Total Affiliations: 5
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 25, n. 3, p. 572-578, 2014-03-00.
Abstract

The present work describes an electrochemical method to produce the copolymer poly(2-methoxy-5-bromo-p-phenylenevinylene)/(2,5-dicyano-p-phenylenevinylene) (cop-MB-PPV/DCN-PPV). This copolymer was proposed due to its D-A characteristic produced by the presence of the electron-donating methoxy moiety and the electron-withdrawing dicyano moiety. The copolymer was electrochemically synthetized by cathodic reduction of the convenient starting materials dissolved in a DMF/LiClO4 using a mercury pool acting as working electrode. The copolymer was characterized by infrared (IR), UV-Vis and fluorescence (FL) spectroscopy and cyclic voltammetry (CV). All the results were compared to the MB-PPV homopolymer. The analysis of electrochemical measurements and IR indicated that the cop-MB-PPV/DCN-PPV was obtained through the formation of blocks containing DCN-PPV units linked by blocks containing MB-PPV units. The electronic structure, performed by CV, UV-Vis and FL showed that the conduction band is more stabilized in the copolymer than in homopolymer. Furthermore, the FL spectra indicated that the light emission of the cop-MB-PPV/DCN-PPV in chloroform solution occurs by means of excimer formation. (AU)