Incorporation of pyrrole to oligothiophene-based quinoids endcapped with dicyanomethylene: a new class of solution processable n-channel organic semiconductors for air-stable organic field-effect transistors
摘要:
我们报告了一系列新型含吡咯的醌类化合物的合成和表征。通过加入吡咯单元来改变醌核结构具有两大优势:首先,吡咯的 N-烷基取代基可以作为增溶基团,从而实现溶液可加工性;其次,N-烷基取代基的变化很容易实现,从而大大丰富了该系列材料的种类。此外,保留的类醌核结构以及抽电子的末端封端基团确保了足够低的 LUMO 能级(低于真空度约 4.30-4.39 eV),满足了空气稳定 n 沟道有机半导体的要求。3b 的 X 射线晶体学数据显示,除支链烷基取代基外,整个分子呈现出很少见的合成构象,因而具有很高的平面度。基于这种含吡咯的类醌的溶液加工 OFET 在环境条件下显示出典型的 n 沟道 FET 特性,最大电子迁移率高达 0.014 cm2 V-1 s-1,离子/离子关值约为 104,这表明该系列材料有望成为可溶液加工的 n 沟道半导体候选材料,而采用吡咯分子构建类醌核心结构则为新型 n 沟道有机半导体的开发提供了一种有效的方法。
Modular synthesis of polymers containing 2,5-di(thiophenyl)-<i>N</i>-arylpyrrole
作者:Tran N. B. Truong、Suchol Savagatrup、Intak Jeon、Timothy M. Swager
DOI:10.1002/pola.28990
日期:2018.6.1
to synthesize functionalized 2,5‐di(thiophen‐2‐yl)‐1‐H‐arylpyrroles from readily available starting materials. These units are compatible with various polymerization conditions and are versatile building blocks for conjugated polymers. The polymers show high thermal stability and solubility in a number of solvents. Characterization of the polymers reveals a correlation between molecular packing, controllable
Peculiarities of the behavior of succinyl dichloride in Friedel-Crafts reaction with thiophenes*
作者:V. I. Smirnov、A. V. Afanas’ev、L. I. Belen’kii
DOI:10.1007/s10593-011-0653-z
日期:2011.1
The reactions of thiophene, 2-methyl-, and 2-bromothiophene with succinyldichloride in the presence of AlCl3, TiCl4, and SnCl4 have been studied. The effect of the acylation conditions, the relative amounts and nature of the Lewis acid on the ratio and yields of the 1,4-di(2-thienyl)-1,4-diones and 4-oxo-4-(2-thienyl)butyric acids formed have been demonstrated. Under the reaction conditions, the formation
Unsubstituted polythiophene (PT) with defined and known high molecular mass (up to ca. 36 000 g mol–1 (Mw)) and low structural defects (ca. 3.6 mol %) as highly attractive semiconducting material is presented. The new synthetic strategy for this polymer is based on the combination of Stille-type polycondensation reactions, ultrasound-assisted dispersion technique, and microwave-assisted ring-closure
未取代的聚噻吩(PT),具有确定的和已知的高分子质量(最大约36000 g mol –1(M w))和低结构缺陷(约3.6 mol%)作为高吸引力的半导体材料被介绍。这种聚合物的新合成策略是基于Stille型缩聚反应,超声辅助分散技术和微波辅助闭环反应的结合。斯蒂勒型缩聚反应的使用产生了二酮缩醛预聚物,其具有良好的溶解性,并且对于最终的不溶性PT具有预先和可控的聚合度(DP)。超声处理可保留较大的界面面积,而微波可为最后的异相闭环反应提供快速有效的加热。通过固态NMR,TEM,UV-vis吸收和荧光发射光谱,XRD,TGA对最终产物进行表征
Comparison of Thiophene-Pyrrole Oligomers with Oligothiophenes: A Joint Experimental and Theoretical Investigation of Their Structural and Spectroscopic Properties
作者:María Moreno Oliva、Ted M. Pappenfus、Jacob H. Melby、Kathryn M. Schwaderer、Jared C. Johnson、Kari A. McGee、Demetrio A. da Silva Filho、Jean-Luc Bredas、Juan Casado、Juan T. López Navarrete
DOI:10.1002/chem.201000143
日期:——
series of mixed thiophene–pyrroleoligomers to investigate the electronic benefits arising from the combination of these two heterocycles. The oligomers are functionalized with several hexyl and aryl groups to improve both processability and chemical robustness. An analysis of their spectroscopic (absorption and emission), photophysical, electrochemical, solid state, and vibrational properties is performed
Gamma-diketones for treatment and prevention of aging skin and wrinkles
申请人:Samumed, LLC
公开号:US10434052B2
公开(公告)日:2019-10-08
The present disclosure relates to compounds having the following structure:
or a dermatologically acceptable salt thereof, and cosmetic or dermopharmaceutical compositions comprising the same, and methods for using the compounds or compositions for treating, protecting, and/or improving the condition and/or aesthetic appearance of skin, for example, treating, preventing, ameliorating, reducing and/or eliminating fine lines and/or wrinkles of skin, or improving the appearance of fine lines and/or or wrinkles of skin comprising application of the compounds or compositions disclosed.