Electronic conjugated poly

The fluorescence excitation and emission spectra of the electrogenerated fused benzothiophene oligomers [poly(39) and poly(41)] show the existence of dramatic red shifts of the fluorescence maxima and important increases of the fluorescence intensity relative to the parent monomers. These results suggest the existence of extended electronic conjugation in the oligomer chains. Poly(39) and poly(41) showed a well-structured excitation band with maxima at about 335 nm and 395 nm, respectively. These excitation maxima are strongly red shifted by about 50 and 108 nm, respectively, against the 39 and 41 excitation spectra. The emission spectra are characterized by a relatively wide, poorly structured band, centered at 410 nm and 445 nm, respectively. These emission maxima also present dramatic red shifts relative to the emission spectra of the parent monomers. 

The recent approaches toward the functional macromolecules in the dithia-fulvene-based systems have been highlighted. The conjugated poly-donor molecules have been synthesized to combine the processability with the significant electron-donating properties of the dithiafulvene systems. Some of them formed CT complexes with organic acceptors, such as TCNQ, achiev-... 

The most spectacular member of this group is the poly(p-phenylene-terephthalamide), better known under its commercial names Kevlar and Twaron. Here we have the combined effects of intra-molecular 7i-electron conjugation between aromatic rings and CONH-groups and the inter-molecular hydrogen-bonding of the CONH-groups. The increment of the latter is, hence, elevated from 15.0 to 30.0 (Table 6.1B). 

Kambe [3] prepared electroluminescent devices containing two or more stacked organic layers, one of which consisted of an electron injecting an organic layer of conjugated poly(aryl-oxadiazole) derivatives, (111) and (IV). 

Brabec CJ, Zerza G, Cerullo G, Silvestri SD, Luzzati S, Hummelen JC, Sariciftci S (2001) Tracing photoinduced electron transfer process in conjugated poly-mer/fullerene bulk heterojunctions in real time. Chem Phys Lett 340 232... 

Dennler G, Mozer AJ, Juska G, Pivrikas A, Osterbacka R, Fuchsbauer A, Sariciftci NS (2006) Charge carrier mobility and lifetime versus composition of conjugated poly-mer/fullerene bulk-heterojunction solar cells. Org Electron 7 229... 

The polymers having delocalized r-electron in the main chain have been expected to possess extremely large third-order optical susceptibility.However, such an extended jr-electron conjugation generally rendered the polymers insoluble and infusible as well, which has seriously limited the fabrication of practical NLO devices. Recently, it was reported that the third-order nonlinear optical properties of poly(l,6-heptadiyne)s which were environmentally stable, soluble, and processable. The third-order optical nonlinearities of poly(l,6-heptadiyne)s bearing NLO active chomophores were evaluated for the first time. The third-order nonlinear susceptibility... 

Solution properties indicate that the metal-poly(yne)s exist in a rod-like structure. They display lyotropic nematic mesophases [30] and form crystallites with a diameter of up to 50 nm [31]. Absorption and luminescence spectra of the polymers show that 7t-electron conjugation is expanded over the whole polymer chain, and third-order non-linear optical properties are exhibited. For polymer 7 good photocurrents were found in sandwich-diodes. 

Roncali, J. [1992], Conjugated poly[thiophenes) Synthesis, functionalization, and appiications, Chem. Rev., 92, pp. 711-738. Gadgii, B., Damlin, R, Aaritaio, T, Kankare, ]., and Kvarnstrdm, C. (2013). Electrosynthesis and characterization of viologen cross linked thiophene copolymer, Electrochim. Acta, 97, pp. 378-385. Nalwa, H. S. (2001). Advanced Functional Molecules and Polymers Electronic and Photonic Properties, 3 (Gordon and Breach Science Publishers, Amsterdam, The Netherlands]. 

Morikita, T., I. Yamaguchi, and T. Yamamoto. 2001. New charge transfer-type p-conjugated poly(aryleneethynylene) containing benzo[2,l,3]thiadiazole as the electron-accepting unit. Adv Mater 13 1862. 

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