Solvatochromic properties of poly[3-(6-methoxyhexyl)-2,5-thienylene] in different solvent mixtures

Lanzi, Massimiliano; Bizzarri, Paolo Costa; Casa, C. Della

doi:10.1016/s0379-6779(97)81215-5

Cited by 70 publications

(8 citation statements)

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“…To our knowledge, so far there has not been any report on the solvatochromism of oxadiazole-containing conjugated polymers, although the phenomenon has been widely observed on other soluble conjugated polymers, especially substituted polythiophenes. [20][21][22][23] With the increase of R, the maximum absorption of the polymer shifts from 341 nm in pure chloroform to 389 nm with well-defined vibronic shoulders at 340, 418, and 445 nm in MeOH-rich mixed solvents. The spectral change corresponds to the disorder to order transformation of the conjugated polymeric chains, which has been dem-onstrated for other substituted conjugated polymers.…”

Section: Resultsmentioning

confidence: 99%

“…The spectral change corresponds to the disorder to order transformation of the conjugated polymeric chains, which has been dem-onstrated for other substituted conjugated polymers. [19][20][21][22] It is worth noticing that the absorption spectra of the new polymer in the MeOH-rich mixed solvents even shift to longer wavelengths by 37 nm with respect to that in its film states. This means that the polymer has a more extensive conjugated structure in the MeOHrich solvents than in its film states.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Characterization of a New p−n Diblock Light-Emitting Copolymer

et al. 1998

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In this paper we present the synthesis and characterization of a new light-emitting copolymer constituted of regularly alternating segments of 3,3'-didecyl-2,2'-bithiophene and 2,6-bis(1,3,4-oxadiazolyl)toluene, which are p-dopable and n-dopable, respectively. The new polymer emits intense green light under the irradiation of UV light in its film states and shows strong solvatochromism both on absorption and on emission. The n-doping potential of the polymer is measured to be similar with that of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and other reported oxadiazole-containing polymers, the currently excellent electron-transporting materials, while its p-doping potential is much lower than those of other oxadiazole-containing light-emitting polymers and is comparable with that of poly(p-phenylenevinylene) (PPV) and polythiophenes (PT), the typical p-dope type materials. The presented synthesis reveals a possible approach to balance the rates of injection of electrons and holes from opposite contacts into an emissive layer in polymer light-emitting diodes by controlling the intrinsic properties of light-emitting materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of a New p−n Diblock Light-Emitting Copolymer

et al. 1998

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“…The nature of these aggregates still stimulates the interest of the scientific community because the presence of π–π interactions among PAT chains can induce some interesting behaviors, such as a secondary doping in conducting PATs , a more extended conjugation length, which is responsible for a more extended UV–vis absorption spectrum as well as for a higher electrical conductivity, and an increased charge carrier mobility, particularly useful when the polymer is employed as an electron-donor material in polymeric solar cells. On the contrary, less regioregular polymers are also less solvatochromic. ,− …”

Section: Introductionmentioning

confidence: 99%

Π-Stacking Signature in NMR Solution Spectra of Thiophene-Based Conjugated Polymers

et al. 2017

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Studies on conjugated polymers seldom report on their NMR characterization in solution. This paper shows how NMR experiments, both 1 H NMR and routine 2D NMR spectra, can help in gaining a further insight into the aggregation behavior of conjugated polymers and could be used to flank the more employed solid-state NMR and other spectroscopy and microscopy techniques in the understanding of the aggregation processes. NMR spectroscopy allows distinguishing, within the class of poorly solvatochromic conjugated polymers, those highly prone to form π-stacked aggregates from the ones that have a low tendency toward π-stacking.

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“…It is also worth stressing the remarkable bathochromic shift of the maximum absorption because of the mesomeric effect provided by sulfur in these thiohexyl polymeric derivatives with respect to the related HH-TT polymer bearing the hexyl substituent directly linked to thiophene ring, characterized by a λ max value of 378 nm only. 24 The more extended electronic conjugation exhibited the branched samples was also confirmed by the FT-IR spectra (Figure S5) through the observation of the intensity ratios between asymmetric (around 1540 cm −1 ) and symmetric (around 1460 cm −1 ) CC aromatic stretching, 25,26 resulting higher for PT2Sbr1 and PT2Sbr2 with respect to the linear derivatives.…”

Section: Resultsmentioning

confidence: 53%

“…The more extended electronic conjugation exhibited by the branched samples was also confirmed by the FT-IR spectra (Figure S5) through the observation of the intensity ratios between asymmetric (around 1540 cm –1 ) and symmetric (around 1460 cm –1 ) CC aromatic stretching, , resulting higher for PT2Sbr1 and PT2Sbr2 with respect to the linear derivatives.…”

Section: Resultsmentioning

confidence: 54%