2015
DOI: 10.1039/c5nj01671a
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Electronic and structural properties of polymers based on phenylene vinylene and thiophene units. Control of the gap by gradual increases of thiophene moieties

Abstract: Several poly(thiophene) derivatives containing p-phenylenevinylene (PV) as an electron-donor were synthesized using FeCl 3 . PV units are regularly spaced in two, four and eight thiophenyl units across the main chain. PV units and the gradual increase in the number of thiophene units affect the properties of polymers such as poly(3-hexylthiophene), (P3HT). Polymers, labeled as poly(FV1Th), poly(FVBiTh) and poly(FVTeTh) were characterized by FT-IR and UV-Vis spectrometry, elemental analysis, thermal stability (… Show more

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Cited by 17 publications
(19 citation statements)
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(61 reference statements)
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“…Retention of the selectivity was also confirmed by the presence of two doublets in the 1 H NMR spectrum with a coupling constant around 16 Hz for TRI‐2 tph, which has a star‐like shape with six thiophene units; nonetheless, the very low solubility of TRI‐3 tph did not allow the full assignment of this derivative. No completed assignment of similar systems was reported in other studies . MALDI‐TOF analysis confirmed unequivocally the presence of the final derivatives in all cases (Figure S1–S5).…”
Section: Resultssupporting
confidence: 50%
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“…Retention of the selectivity was also confirmed by the presence of two doublets in the 1 H NMR spectrum with a coupling constant around 16 Hz for TRI‐2 tph, which has a star‐like shape with six thiophene units; nonetheless, the very low solubility of TRI‐3 tph did not allow the full assignment of this derivative. No completed assignment of similar systems was reported in other studies . MALDI‐TOF analysis confirmed unequivocally the presence of the final derivatives in all cases (Figure S1–S5).…”
Section: Resultssupporting
confidence: 50%
“…To our knowledge, no detailed analyses of the 1 H and 13 C NMR data for compounds with three thiophene units is available, probably due to the overlapped peaks and the low solubility of these molecules. Here, we assigned proton and carbon signals through a set of 1D and 2D experiments.…”
Section: Resultsmentioning
confidence: 99%
“…In Table are summarized the optical and electrochemical properties of the PAzMCs. The optical bandgaps ( E g opt ) were calculated from the Tauc approximation ( E g opt = 1240/ λ edge , where λ edge corresponds to the absorption edge wavelength of the lower electronic transition band) . For DMSO or THF PAzMCs solutions, the estimated bandgaps were ca 3.12 eV.…”
Section: Resultsmentioning
confidence: 99%
“…The π–π* red-shift combined with the larger CT intensity and its narrower broadening for Group A samples ( H1 , H3 , H4 and H6 ) is indicative of a lower molecule distortion, lower intermolecular interaction (no aggregation) and larger planarity that contribute to a decrease in the structural disorder of the material, compared to Group B compounds ( H2 and H5 ) [ 24 , 25 , 26 ]. Ellipsometric data have been confirmed by Raman measurements, as shown in Figure 7 .…”
Section: Resultsmentioning
confidence: 99%