Iguarbe Verónica, Concellón Alberto, Termine Roberto, Golemme Attilio, Barberá Joaquín, Serrano José Luis
Instituto de Ciencia de Materiales de Aragón, Departamento de Química Orgánica, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
LASCAMM CR-INSTM, CNR-NANOTEC Lab LiCryL, Dipartimento di Fisica, Università della Calabria, 87036 Rende, Italy.
ACS Macro Lett. 2018 Sep 18;7(9):1138-1143. doi: 10.1021/acsmacrolett.8b00505. Epub 2018 Sep 7.
Highly conductive coaxial supramolecular wires are prepared by using a new family of dendrimers that combines two rigid aromatic parts and two flexible aliphatic parts. The two external regions consist of a promesogenic block based on a third generation Percec-type dendron with four terminal dodecyloxy alkyl chains, whereas the two internal regions are formed by one, two, or three carbazole units bearing flexible spacers. These functional dendrimers self-organize in columnar liquid crystal phases with a strong coaxial segregation within each column. Interestingly, the charge mobility studies revealed that these dendrimers display semiconductor properties with hole mobility values up to 0.5 cm V s, depending on the packing within the columns which can be tuned by the number of carbazole functional units. The high hole mobility values measured in these materials are among the highest values reported for columnar liquid crystals.
通过使用一类新型树枝状聚合物制备了高导电同轴超分子线，这类树枝状聚合物结合了两个刚性芳香部分和两个柔性脂肪族部分。两个外部区域由基于具有四个末端十二烷氧基烷基链的第三代Percec型树枝状分子的前介晶嵌段组成，而两个内部区域由带有柔性间隔基的一个、两个或三个咔唑单元形成。这些功能性树枝状聚合物在柱状液晶相中自组装，在每个柱内具有强烈的同轴偏析。有趣的是，电荷迁移率研究表明，这些树枝状聚合物表现出半导体特性，空穴迁移率值高达0.5 cm² V⁻¹ s⁻¹，这取决于柱内的堆积情况，而堆积情况可通过咔唑功能单元的数量进行调节。在这些材料中测得的高空穴迁移率值是柱状液晶所报道的最高值之一。
