A Fourier transform-Raman spectroscopic study of electrically conducting polypyrrole films

Jenden, Charles M.; Davidson, R. G.; Turner, T.G.

doi:10.1016/0032-3861(93)90323-3

Cited by 60 publications

(39 citation statements)

References 13 publications

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“…At this longer excitation wavelength, the intensity of the Raman signals from the neutral polypyrrole are quite weak above 1100 cm-' so they appear noisy but the peaks below this are strong and sharp. The previously reported FT-spectra (20) are significantly broader in this region due to recording the spectra at a Can. J. Chem.…”

Section: Wavelength Dependence Of Intensitiesmentioning

confidence: 89%

“…Jenden et ul. (20) attribute the peak near 1500 cm-' to some pyrrole rings adapting a cis geometry but peaks near 1500 and 1600 cm-' are typical of C=C stretching bands in the spectra of 2,5-dialkylpyrrole derivatives so we consider the longer sources to be probing a nonconjugated component of the neutral polymer.…”

Section: Wavelength Dependence Of Band Positionsmentioning

confidence: 99%

“…A list of generally accepted assignments is provided in Table 1. Recently, FT-Raman spectra of neutral and oxidized polypyrrole (with relatively large counterions) have been published (20). In addition, an FT-Raman study of a polypyrrole-polyester composite has been discussed (21).…”

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confidence: 99%

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Raman and resonance-Raman spectra of polypyrrole with application to sensor – gas probe interactions

Vigmond¹,

Ghaemmaghami²,

Thompson³

1995

Can. J. Chem.

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Raman spectra of the oxidized and neutral forms of polypyrrole show a relative intensity shift from the high wave number region to the low wave number region as the source wavelength is increased from 514.5 to 1064 nm. Variations in band positions are also observed with changes in excitation source; particularly, two C=C stretches at 1500 and 1605 cm−1 can be observed with the neutral polymer but only a single band is observed at 1575 cm−1 when sources of higher energy are used. These changes arise from differences in the electronic states of the two forms that can greatly alter the intensities of the numerous bands. The oxidized and neutral forms of the polymer both act as electron acceptors towards the gas phase species tested here (toluene, water, methanol, and ammonia). The increased electron density induces an upward shift of the peaks at 915 and 1035 cm−1 of the neutral polymer and increases the relative intensity of the 1575 cm−1 peak of the oxidized polymer using 1064 and 514.5 nm sources, respectively. Keywords: polypyrrole, Raman spectroscopy, gas probe interactions.

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Section: Wavelength Dependence Of Intensitiesmentioning

confidence: 89%

Section: Wavelength Dependence Of Band Positionsmentioning

confidence: 99%

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Raman and resonance-Raman spectra of polypyrrole with application to sensor – gas probe interactions

Vigmond¹,

Ghaemmaghami²,

Thompson³

1995

Can. J. Chem.

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“…The 1539 and 1291 cm À1 bands are often observed in various nitrogen heterocyclic systems [19], the latter does not have its analog in the monomer spectrum. It should be mentioned that analogous peaks are observed in FT Raman spectra of both polypyrrole [20] and poly(5-aminoquinoxaline). The appearance of this peak indicates that nitrogen in the polymer is involved in the polyconjugated structure.…”

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confidence: 70%

Electrochemistry of Benzophenanthridine Alkaloids. Formation and Characterization of Redox Active Films from Products of Sanguinarine and Chelerythrine Oxidation

et al. 2005

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The behavior of sanguinarine and chelerythrine alkaloids upon electrochemical oxidation on solid electrodes in buffered aqueous medium is reported in this study. Electro-oxidation of sanguinarine and chelerythrine results in the formation of redox active electropolymerized films. The films were characterized by cyclic voltammetry, EQCM and surface enhanced Raman scattering spectroscopy excited in near-infrared range. The electropolymerization is suggested to proceed via formation of alkaloids ortho-benzoquinone derivatives.

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“…(2) Alkyl chain group modes at 1450±1370 cm À1 , essentially due to methyl and methylene bendings, which often overlap with typical ring modes (3,4,5) and are enhanced by increasing the length of the alkyl chain, although calculations performed for poly(3-alkylpyrrole)s suggest the FT-IR spectrum pattern to be still dominated by ring modes [26]. (3) CÐH deformations involving ring groups (7,9,10) [19±21, 23,27,28] and the NÐH bending (8) which, according to literature data [29], are to be assigned to the 1120±1130 cm À1 frequencies.…”

mentioning

confidence: 99%

Characterization of electrochemically synthesized alkylpyrrole intrinsically conducting polymers

Costantini

Capaccioli

Geppi

et al. 2000

Polym. Adv. Technol.

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A Fourier transform-Raman spectroscopic study of electrically conducting polypyrrole films

Cited by 60 publications

References 13 publications

Raman and resonance-Raman spectra of polypyrrole with application to sensor – gas probe interactions

Raman and resonance-Raman spectra of polypyrrole with application to sensor – gas probe interactions

Electrochemistry of Benzophenanthridine Alkaloids. Formation and Characterization of Redox Active Films from Products of Sanguinarine and Chelerythrine Oxidation

Characterization of electrochemically synthesized alkylpyrrole intrinsically conducting polymers

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