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Type: Artigo de periódico
Title: Spectroscopic Investigation Of Conjugated Polymers Derived From Nitroanilines
Author: Ando R.A.
do Nascimento G.M.
Landers R.
Santos P.S.
Abstract: For the first time, the resonance Raman spectroscopy was used to characterize polymers derived from meta- and para-nitroanilines. In order to improve the polymer structure analysis, other techniques were also used such as FTIR, UV-vis, XRD, XPS, EPR and N K-XANES. The insertion of strong electron-withdrawing groups (NO2) in polyaniline (PANI)-like backbone causes drastic changes in the lower energy charge transfer states, related to the polymer effective conjugation length. The resonance Raman data show that the NO2 moiety has a minor contribution on the CT state in poly(meta-nitroaniline), PMN, while in the poly(para-nitroaniline), PPN, the quinoid structure induced by para-substitution increases the charge density of NO2 groups, causing a more localized chromophore. The characterization of the imine nitrogen and of the protonated segments was done by XPS, N K-XANES and EPR spectroscopies and the lower polymerization degree of PPN, in comparison to PMN, is confirmed by XRD and TG data. © 2007 Elsevier B.V. All rights reserved.
Citation: Spectrochimica Acta - Part A: Molecular And Biomolecular Spectroscopy. , v. 69, n. 2, p. 319 - 326, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.saa.2007.03.046
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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