Synthesis of new thiophene-based π-conjugated polymers for investigation of molecular alignment on the surface of platinum plate
Synthesis of new thiophene-based π-conjugated polymers for investigation of molecular alignment on the surface of platinum plate
复制标题
DOI：
10.1021/ma060254q
复制
发表时间：
2006-05
期刊：
影响因子：
5.5
通讯作者：
H. Kokubo;Takao Sato;Takakazu Yamamoto
中科院分区：
文献类型：
--
作者：
H. Kokubo;Takao Sato;Takakazu Yamamoto
使用π共轭聚合物的电子器件是许多论文的主题。1-4π共轭聚合物在浇铸或旋涂薄膜中的形态被认为是决定器件性能的重要因素。2最近的研究表明，一些具有烷基侧链的π共轭聚合物在不同衬底上的铸膜层中具有很强的有序性，烷基侧链朝向衬底表面。图1描述了这种头尾式聚(3-烷基噻吩基-2，5-二基)(HT-P3RTh)的这种排列的例子；p掺杂的HT-P3RTh也可以形成这种有序的固体结构。8b，c图1显示了报道的π共轭聚合物的例子，这种聚合物在衬底表面形成了这样的有序结构。这种聚合物的一个明显特征是在从溶液到固体的过程中，UV-Vis峰向更长的波长移动。5-11位移(图1中的Δλ值)通常大于50 nm，这表明聚合物分子之间存在强烈的分子间相互作用和/或固体中π共轭聚合物主链的平坦化效应。相反，其他聚合物，如HT-聚(6-烷基吡啶-2，5-二基)只产生很小的UV-Vis位移
Electronic devices using π-conjugated polymers are the subject of many papers. 1-4 Morphology of the π-conjugated polymer in cast or spin-coated film is considered to be an important factor to decide the device performances. 2 Recently, it has been demonstrated that some of π-conjugated polymers with alkyl side chains have a strong tendency to assume an ordered structure in cast films on various substrates, with the alkyl side chains oriented toward the surface of the substrate. 2, 5-10 An example of such alignment of head-to-tail-type poly (3-alkylthiophene-2, 5-diyl)(HT-P3RTh) is depicted in Figure 1; p-doped HT-P3RTh can also form such an ordered solid structure. 8b, c Chart 1 shows reported examples of π-conjugated polymers which give such an ordered structure on the surface of the substrate.One of the obvious features of such polymers is a large shift of the UV-vis peak to a longer wavelength in going from the solution to the solid state. 5-11 The shift (Δλ value in Chart 1) is usually larger than 50 nm, which suggests the presence of a strong intermolecular interaction between the polymer molecules and/or planarization effect of the π-conjugated polymer backbone in the solid. 5-16 In contrast, other polymers such as HT-poly (6-alkylpyridine-2, 5-diyl) gives only a small UV-vis shift