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Type: Artigo de periódico
Title: Synthesis and spectroscopic characterization of polymer and oligomers of ortho-phenylenediamine
Author: SESTREM, Ricardo H.
FERREIRA, Daniela C.
LANDERS, Richard
NASCIMENTO, Gustavo M. do
Abstract: Poly(ortho-phenylenediamine) and oligomers of ortho-phenylenediamine were chemically synthesized and characterized by UV-vis, (1)H and (13)C NMR, FTIR and resonance Raman spectroscopies. Polymerization of ortho-phenylenediamine in HCl medium with ammonium persulfate only leads the trimer compound, in disagreement with some previous reports. Nevertheless, in acetic acid medium it was possible to prepare a polymer constituted by ladder phenazinic segments with different protonation levels and quinonediimine rings (polyaniline-like). X-ray absorption at N K-edge (N K XANES), X-ray photoelectron (XPS) and Electron paramagnetic resonance (EPR) spectroscopies were used to determine the different kinds of nitrogen presents in this class of polymer. N K XANES spectrum of poly(ortho-phenylenediamine) shows the band of -N=nitrogen of non-protonated phenazinic rings at 398.2 eV. In addition, XPS and N K XANES data confirm the presence of different types of protonated nitrogens in the polymeric poly(ortho-phenylenediamine) chain and the EPR spectrum shows that the polymer has a very weak polaronic signal. (C) 2009 Elsevier Ltd. All rights reserved.
Subject: Raman spectroscopy
Conducting polymers
Country: Inglaterra
Rights: fechado
Identifier DOI: 10.1016/j.eurpolymj.2009.12.007
Date Issue: 2010
Appears in Collections:IFGW - Artigos e Outros Documentos

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