In search of efficient solubilizing groups for liquid and luminescent oligo(phenylene-thiophene) chromophores
作者:Yuriy N. Luponosov、Dmitry O. Balakirev、Ivan V. Dyadishchev、Alexander N. Solodukhin、Marina A. Obrezkova、Evgeniya A. Svidchenko、Nikolay M. Surin、Sergey A. Ponomarenko
DOI:10.1039/d0tc04536e
日期:——
liquefaction for them. It was revealed that oligomers with long and branched alkyl SGs still retain high crystallinity, whereas oligomers with alkyl-oligodimethylsiloxane SGs combine very low glass transition temperatures (up to −111 °C) with a liquid-crystalline behaviour. The alkylsilyl SGs were found to be the most efficient, since the oligomersend-capped with trihexyl- and tri(2-butyloctyl)silyl
在这项工作中,具有刚性封端的,共轭的4,4'-双(2-噻吩基)联苯片段被各种类型的增溶基团(SGs)(例如烷基或烷基甲硅烷基或烷基-低聚二甲基硅氧烷)封端的低聚物的合成被报道。与具有简单的己基或三甲基甲硅烷基SG的模型高结晶性低聚物相比,对它们的热和光学性质以及流变学进行了全面研究,这使我们能够阐明结构-性质的相关性,并在液化方面找到了最强大的SG类型。结果表明,具有长链和支链烷基SG的低聚物仍保持较高的结晶度,而具有烷基-低聚二甲基硅氧烷SG的低聚物将极低的玻璃化转变温度(高达-111°C)与液晶性能结合在一起。已发现烷基甲硅烷基SG最有效,因为被三己基和三(2-丁基辛基)甲硅烷基SG封端的低聚物是液体,并且玻璃化转变温度(最高-60°C)和低粘度(最高1.94 Pa s)。所制备的所有低聚物均具有相似的光吸收/发光光谱,并且溶液中的光致发光量子产率较高(90-95%),而对SG类型没有
Synthesis and characterization of symmetrical sulfur-fused polycyclic aromatic hydrocarbons with controlled shapes
作者:Jianghui Yin、Yumiao Hu、Dengqing Zhang、Xianying Li、Wusong Jin
DOI:10.1016/j.tet.2017.08.020
日期:2017.9
Here we report and establish a facile synthetic method for these unprecedented sulfur-fused polycyclicaromatichydrocarbons (S-PAHs) with symmetrical structures (C2-rectangle and D6h-hexagonal shape). Characterization by laser desorption/ionization time-of-flight massspectrometry unambiguously validate the successful formation of these novel S-PAHs. The C2-rectangle and D6h-hexagonal-shaped S-PAHs
Iridium-catalyzed borylation of thiophenes: versatile, synthetic elaboration founded on selective C–H functionalization
作者:Ghayoor A. Chotana、Venkata A. Kallepalli、Robert E. Maleczka、Milton R. Smith
DOI:10.1016/j.tet.2008.02.111
日期:2008.6
various substituted thiophenes to synthesize poly-functionalized thiophenes in good to excellent yields. Apart from common functionalities compatible with iridium-catalyzed borylations, additional functional group tolerance to acyl (COMe), and trimethylsilyl (TMS) groups was also observed. High regioselectivities were observed in borylation of 3-and 2,5-di-substituted thiophenes. Electrophilic aromatic
A Chiral Macrocyclic Oligothiophene with Broken Conjugation – Rapid Racemization through Internal Rotation
作者:Kevin J. Weiland、Nathalia Münch、Wanja Gschwind、Daniel Häussinger、Marcel Mayor
DOI:10.1002/hlca.201800205
日期:2019.1
characterized and its dynamic racemization is analyzed by variable temperature NMR experiments. The racemization barrier hints with 38 kJ/mol at rapid enantiomerization at room temperature by Mislow’s ‘Euclidian rubber glove’ enantiomerization process. Macrocycle formation results in red‐shifted absorption and emission spectra, hinting at increased conjugationthrough the oligothiophene versus the trough space