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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.
TEMPERINI, Marcia L. A.
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.|
|Editor:||PERGAMON-ELSEVIER SCIENCE LTD|
|Appears in Collections:||IFGW - Artigos e Outros Documentos|
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|art_SESTREM_Synthesis_and_spectroscopic_characterization_of_polymer_and_2010.pdf||published version||1.13 MB||Adobe PDF||View/Open|
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