Resonant Raman scattering and photoinduced infrared active vibration spectroscopy of poly(isothianaphthene)

Poplawski, J.; Ehrenfreund, E.; Schäffer, H.; Wudl, Fred; Heeger, A.J.

doi:10.1016/0379-6779(89)90571-7

Cited by 11 publications

(19 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All the m ajor bands and their assignments are listed in Table I. The band positions are consistent with the published studies, 1,11,12,23,24 except for the band at 1680 cm 2 1 , which is assigned to -C5O stretching. Carbonyl group formation at the ends of the polymer chains m ay occur during the O 2 induced polymerization, as has been previously reported, 25 and further details will be published separately.…”

Section: Preparation Of Iodine-doped Poly(isothianaphthene)supporting

confidence: 85%

“…Far-infrared peaks of undoped PITN are observed at the following wavenumbers: 190(w) and 434(s) cm 2 1 , as previously reported for PITN. [11][12][13] Additional weak peaks were observed at 93(w), 243(w), and 388(w) cm 2 1 . Upon iodine doping, a new peak at 135 cm 2 1 appeared, which is assigned to the n 3 m ode of I 3 2 .…”

Section: Preparation Of Iodine-doped Poly(isothianaphthene)mentioning

confidence: 93%

“…5), I 3 2 n 1 resonance and overtone bands were clearly obser ved at 107, 214, and 321 cm 2 1 in the spectrum of the highly iodinated PITN lm but are m uch less obvious for the lightly iodine-doped PITN lm. 11,13,24 The assignments of these bands are listed in Table I. When the level of iodine doping is increased, most of the bands broaden and their intensities decrease.…”

Section: Preparation Of Iodine-doped Poly(isothianaphthene)mentioning

confidence: 99%

“…1 The special properties of this polymer are its low band gap (E g ø 1 eV), 2 and its nearly colorless transparency upon doping. 3,4 Vibrational spectroscopy has proved to be a useful method for the study of the effect of doping on polymer lms, the structure of electronically conductive polymer lms of polyacetylene, 5 polypyrrole, [6][7][8] polythiopthene, 9,10 and poly(isothianaphthene), [11][12][13] and it is also sensitive to the structural changes arising from the creation of polarons and bipolarons upon doping. Doping generates electronic defects by rem oval or addition of electrons and produces new electronic states within the band gap of the polymer.…”

Section: Introductionmentioning

confidence: 99%

“…These states give rise to new absorption bands in the visible or NIR regions, and vibrations associated with the defects can be observed by Raman spectroscopy. 14 The processes of electrochemical oxidation and reduction of polymer lms have been investigated in detail, [5][6][7][8][9][10][11][12][13] but the chemical oxidation and reduction of PITN powders have attracted much less attention despite the potential importance of this form of the polymer. It is not well established whether the difference in m orphology between lms and powders will affect the properties of doped EXPERIMENTAL M aterials.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Vibrational Spectroscopic Study of Iodine-Doped Poly(Isothianaphthene)

et al. 2002

View full text Add to dashboard Cite

Far-infrared, mid-infrared, and Raman spectroscopy were used to characterize iodine-doped poly(isothianaphthene) (PITN) films and powders. The far-infrared and mid-infrared results show changes from absorption mode to reflective mode as the doping level increases, consistent with the iodine-doped PITN becoming more metallic and more conductive at higher doping levels. The far-IR and Raman (514.5-nm laser excitation) results show that I3− is dominant in iodine-doped PITN. The Raman spectral changes observed using 1064-nm excitation are different from those measured using 514.5-nm excitation. The spectra recorded with 514.5-nm excitation show features due to the undoped parts of the polymer, and these indicate that the effective conjugated chain length decreases with increased doping. The Raman spectra obtained by using 1064-nm excitation show features due to polaron and bipolaron states in the doped polymer.

show abstract