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排序方式: 共有55条查询结果,搜索用时 78 毫秒
1.
Chaohua Cui Yeping Sun Zhi‐Guo Zhang Maojie Zhang Jing Zhang Yongfang Li 《Macromolecular chemistry and physics.》2012,213(21):2267-2274
Two P3HT isomers with branched alkyl side chains, P3EBT and P3MPT, are synthesized. The HOMO energy levels of P3EBT and P3MPT are ?5.35 and ?5.24 eV, respectively, which are significantly lower than that of P3HT with a linear side chain. The absorption edges of the two P3HT isomer films, especially those of P3EBT, are blue‐shifted in comparison with that of P3HT. A PSC based on P3EBT:IC60BA (2:1 w/w) shows a high open‐circuit voltage of 0.98 V, which is the highest Voc reported so far for polythiophene‐based PSCs. A PSC based on P3MPT:IC70BA (2:1 w/w) exhibits a power conversion efficiency of 3.62% with a Voc of 0.91 V. P3MPT is suitable for the application in tandem PSCs. 相似文献
2.
Improvement in Solubility and Molecular Assembly of Cyclopentadithiophene–Benzothiadiazole Polymer 下载免费PDF全文
Jungho Lee Tomasz Marszalek Kyu Cheol Lee Jonggi Kim Wojciech Pisula Changduk Yang 《Macromolecular chemistry and physics.》2015,216(11):1244-1250
Using linear side chains for conjugated polymers is hindered by their limited solubility in common organic solvents, creating problems during purification and processing, whereas branched alkyl chains generally preclude interchain interdigitation because their bulkiness usually hinders interchain interactions. To compensate the adverse effects from each side chain, it is shown that replacing commonly employed 2‐ethylhexyl (2EH) solubilizing groups with branched 5‐ethylnonyl (5EN) chains not only improves solution processability to PCDT‐BT polymer, but also induces an advantageous change in polymer self‐assembly and backbone orientation in thin films that correlates with an increase in transistor performance.
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Young‐Sik Yoon Kwang‐Han Park Jong‐Chan Lee 《Macromolecular chemistry and physics.》2009,210(18):1510-1518
Poly(3‐thiopheneacetate)/dialkyldimethylammonium complexes (PTA‐Cn) were prepared by mixing regiorandom poly(3‐thiopheneacetic acid) with dialkyldimethylammonium bromide to study the effect of their self‐assembled structures on the optical properties. The lengths of the alkyl groups in the ammonium salts were varied from decyl (C10) to octadecyl (C18) groups. These complexes showed fully developed layer structures with ordered mesophases. PTA‐C16 and PTA‐C18 with longer alkyl groups showed side‐chain crystalline phases, and PTA‐C10, PTA‐C12, and PTA‐C14 with shorter alkyl groups showed side‐chain crystalline and liquid crystalline phases at room temperature. When PTA‐C18 was heated, a melting transition from side‐chain crystalline to smectic liquid crystalline phase was observed at 41.5 °C. The maximum absorption and emission wavelengths of these complexes increased with increasing alkyl chain length indicating that the π‐conjugated structure of the regiorandom thiophene backbone changes according to the alkyl groups.
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Keap1–Nrf2 pathway has emerged as a regulator for the endogenous antioxidant response, which is critical in defending cells against carcinogenesis. Herein, we demonstrated that depleting the cellular level of glutathione (GSH) by a novel electrophilic agent 2-(pro-1-ynyl)-5-(5,6-dihydroxypenta-1,3-diynyl) thiophene (PYDDT) could activate Keap1–Nrf2 pathway. In above process, it was found that Keap1 was modified by S-glutathionylation, an important post-translational modification of protein cysteines with critical roles in oxidative stress and signal transduction. We concluded from our findings that conjugation with intracellular GSH by PYDDT might lead to Keap1 S-glutathionylation and was a key event involved in its Nrf2 inducing activity. 相似文献
7.
《Expert opinion on therapeutic patents》2013,23(3):343-347
Two applications claim novel ureido 5-(2-aminoethoxyphenyl)thiophene-car-boxamide derivatives that differ in the position of the attached alkoxy chain, either ortho or para, as IκB kinase-2 (IKK-2) inhibitors. Some of the compounds display low nanomolar potency, and the compounds are claimed to be useful in the treatment of asthma, rheumatoid arthritis and chronic obstructive pulmonary disease (COPD). 相似文献
8.
Patchara Pedpradab Khanit Suwanborirux 《Journal of Asian natural products research》2013,15(9):879-883
Bioactivity-guided fractionation of the ethyl acetate extract of a marine sponge, Xestospongia sp., led to the isolation of a new thiophene-S-oxide acyclic sesterterpene (1). The chemical structure was extensively analyzed using NMR and mass spectral data. Compound 1 showed weak cytotoxicity against Vero cells. 相似文献
9.
Daniele Conelli Roberto Grisorio Gian Paolo Suranna 《Macromolecular chemistry and physics.》2020,221(11)
Direct arylation polymerization (DArP) relieves the synthesis of conjugated polymers from the use of hazardous and toxic reagents typical of the traditional protocols. However, the compatibility with environmentally benign, nonhazardous, and low‐cost solvents still represents the critical aspect for projecting DArP as an industrial‐scale method for the preparation of conjugated polymers. In this study, a “green” solvent (i.e., cyclopentyl methyl ether) is implemented for the obtainment of poly(3‐hexylthiophene) by DArP reaction, in order to explore sustainable reaction conditions also regarding the catalytic system and the base quantity, which equally undermine the sustainability of the DArP protocol. Considering the molecular weights as the indicator of precatalyst performance in determined conditions, it is established that the cheapest palladium source (i.e., PdCl2) combined with two equivalents of (o‐anisyl)3P is able to yield the best results in the green ethereal solvent. Furthermore, it is found how, with respect to the common DArP protocols, the quantity of the expensive base (i.e., Cs2CO3) can be reduced in these reaction conditions without compromising molecular weights and regioregularity of the resulting polymer. These optimized reaction conditions can be extended to the copolymerization of other monomer units with satisfactory results in terms of molecular weights. 相似文献