Studies on the resonance Raman spectra of polyaniline obtained with near-IR excitation

The effects of near‐IR (NIR) laser power over the Raman spectra of poly(aniline) emeraldine salt (PANI‐ES) and base (PANI‐EB) were investigated. The reasons for the existence of several bands from 1324 to 1500 cm−1 in the Raman spectra of poly(aniline) obtained at NIR region were also studied. The b...

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Veröffentlicht in:	Journal of Raman spectroscopy 2008-07, Vol.39 (7), p.772-778
Hauptverfasser:	do Nascimento, Gustavo M., Temperini, M´rcia L. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Band spectra Bands Conjugation Correlation cross-linking FT-Raman spectroscopy Lasers polyaniline Raman spectra resonance Raman scattering Segments Spectra
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container_title	Journal of Raman spectroscopy
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creator	do Nascimento, Gustavo M. Temperini, M´rcia L. A.
description	The effects of near‐IR (NIR) laser power over the Raman spectra of poly(aniline) emeraldine salt (PANI‐ES) and base (PANI‐EB) were investigated. The reasons for the existence of several bands from 1324 to 1500 cm−1 in the Raman spectra of poly(aniline) obtained at NIR region were also studied. The bands from 1324 to 1375 cm−1 were associated to νCN of polarons with different conjugation lengths and the bands from 1450 to 1500 cm−1 in Raman spectra of PANI emeraldine and pernigraniline base forms were correlated to νCN modes associated with quinoid units having different conjugation lengths. The increase of laser power at 1064.0 nm causes the deprotonation of PANI‐ES and the formation of cross‐linking segments having phenazine and/or oxazine rings. For PANI‐EB only a small spectral change is observed when the laser power is increased, owing to the low absorption of this form in the NIR region. Copyright © 2007 John Wiley & Sons, Ltd.
doi_str_mv	10.1002/jrs.1841
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A.</creator><creatorcontrib>do Nascimento, Gustavo M. ; Temperini, M´rcia L. A.</creatorcontrib><description>The effects of near‐IR (NIR) laser power over the Raman spectra of poly(aniline) emeraldine salt (PANI‐ES) and base (PANI‐EB) were investigated. The reasons for the existence of several bands from 1324 to 1500 cm−1 in the Raman spectra of poly(aniline) obtained at NIR region were also studied. The bands from 1324 to 1375 cm−1 were associated to νCN of polarons with different conjugation lengths and the bands from 1450 to 1500 cm−1 in Raman spectra of PANI emeraldine and pernigraniline base forms were correlated to νCN modes associated with quinoid units having different conjugation lengths. The increase of laser power at 1064.0 nm causes the deprotonation of PANI‐ES and the formation of cross‐linking segments having phenazine and/or oxazine rings. For PANI‐EB only a small spectral change is observed when the laser power is increased, owing to the low absorption of this form in the NIR region. 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A.</creatorcontrib><title>Studies on the resonance Raman spectra of polyaniline obtained with near-IR excitation</title><title>Journal of Raman spectroscopy</title><addtitle>J. Raman Spectrosc</addtitle><description>The effects of near‐IR (NIR) laser power over the Raman spectra of poly(aniline) emeraldine salt (PANI‐ES) and base (PANI‐EB) were investigated. The reasons for the existence of several bands from 1324 to 1500 cm−1 in the Raman spectra of poly(aniline) obtained at NIR region were also studied. The bands from 1324 to 1375 cm−1 were associated to νCN of polarons with different conjugation lengths and the bands from 1450 to 1500 cm−1 in Raman spectra of PANI emeraldine and pernigraniline base forms were correlated to νCN modes associated with quinoid units having different conjugation lengths. The increase of laser power at 1064.0 nm causes the deprotonation of PANI‐ES and the formation of cross‐linking segments having phenazine and/or oxazine rings. For PANI‐EB only a small spectral change is observed when the laser power is increased, owing to the low absorption of this form in the NIR region. Copyright © 2007 John Wiley & Sons, Ltd.</description><subject>Band spectra</subject><subject>Bands</subject><subject>Conjugation</subject><subject>Correlation</subject><subject>cross-linking</subject><subject>FT-Raman spectroscopy</subject><subject>Lasers</subject><subject>polyaniline</subject><subject>Raman spectra</subject><subject>resonance Raman scattering</subject><subject>Segments</subject><subject>Spectra</subject><issn>0377-0486</issn><issn>1097-4555</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNp90EFLwzAcBfAgCs4p-BFyEi_VpGmb5iiiUxkq29RjyNJ_MNolNclw-_Z2KIoHPb3Lj8fjIXRIyQklJD99CfGE1gXdQgNKBM-Ksiy30YAwzjNS1NUu2ovxhRAiREUH6HGalo2FiL3D6RlwgOidchrwRC2Uw7EDnYLC3uDOt2vlbGsdYD9Pqs8Gv9v0jB2okF1PMKy0TSpZ7_bRjlFthIOvHKKHy4vZ-VU2vhtdn5-NM80qTjNhdCNKPa-KWomSqpLOFa_1nHFTMcEEcNEYU5QG-vkmp0XOtdG1yBkjUCnOhujos7cL_m0JMcmFjRraVjnwyygZqwjLRdHD438h7ecUfb1gP1QHH2MAI7tgFyqsJSVy87HsP5abj3uafdJ328L6TydvJtPf3sYEq2-vwqusOOOlfLodyUc6GV2J2X0__gOspYyN</recordid><startdate>200807</startdate><enddate>200807</enddate><creator>do Nascimento, Gustavo M.</creator><creator>Temperini, M´rcia L. 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For PANI‐EB only a small spectral change is observed when the laser power is increased, owing to the low absorption of this form in the NIR region. Copyright © 2007 John Wiley & Sons, Ltd.</abstract><cop>Chichester, UK</cop><pub>John Wiley & Sons, Ltd</pub><doi>10.1002/jrs.1841</doi><tpages>7</tpages></addata></record>
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subjects	Band spectra Bands Conjugation Correlation cross-linking FT-Raman spectroscopy Lasers polyaniline Raman spectra resonance Raman scattering Segments Spectra
title	Studies on the resonance Raman spectra of polyaniline obtained with near-IR excitation
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