Synthesis, luminescence and electrochromism of aromatic poly(amine–amide)s with pendent triphenylamine moieties
作者:Guey-Sheng Liou、Sheng-Huei Hsiao、Tzy-Hsiang Su
DOI:10.1039/b419183h
日期:——
A new triphenylamine-containing aromatic dicarboxylic acid monomer, N,N-bis(4-carboxyphenyl)-Nâ²,Nâ²-diphenyl-1,4-phenylenediamine (2), was synthesized from the amination reaction between 4-aminotriphenylamine and 4-fluorobenzonitrile and subsequent alkaline hydrolysis of the dinitrile intermediate. A series of novel aromatic poly(amineâamide)s with triphenylamine units in the main chain and as the pendent group were prepared from the newly synthesized dicarboxylic acid and various aromatic diamines. These poly(amineâamide)s were amorphous and readily soluble in many organic solvents. All the polymers could be solution-cast into flexible films with good mechanical properties. They had excellent levels of thermal stability associated with high glass-transition temperatures (226â261 °C). These polymers exhibited strong UVâvis absorption bands at 350â365 nm in NMP solution. Their photoluminescence spectra showed maximum bands around 512â543 nm in the green region. The hole-transporting and electrochromic properties are examined by electrochemical and spectroelectrochemical methods. Cyclic voltammograms of the poly(amineâamide)
5a prepared from the dicarboxylic acid monomer 2 with a structurally similar diamine monomer N,N-bis(4-aminophenyl)-Nâ²,Nâ²-diphenyl-1,4-phenylenediamine (4a) exhibited four reversible oxidation redox couples in acetonitrile solution at E1/2
= 0.60, 0.80, 0.97 and 1.13 V, respectively. All the poly(amineâamide)s exhibited excellent reversibility of electrochromic characteristics by continuous five cyclic scans between 0.0 to 1.30 V, with a color change from the original pale yellowish neutral form to the green and then to blue oxidized forms.
一种新的含三苯胺的芳香族二羧酸单体--N,N-双(4-羧基苯基)-Nâ²,Nâ²-二苯基-1,4-苯二胺(2),是由 4-氨基三苯胺和 4-氟苯腈发生胺化反应,然后二腈中间体发生碱性水解而合成的。利用新合成的二羧酸和各种芳香族二胺,制备了一系列新型芳香族聚(胺)酰胺,其主链和悬垂基均含有三苯胺单元。这些聚(胺)酰胺呈无定形,易溶于多种有机溶剂。所有聚合物都可以溶液浇铸成具有良好机械性能的柔性薄膜。它们具有出色的热稳定性,玻璃转化温度高(226-261 °C)。在 NMP 溶液中,这些聚合物在 350- 365 纳米波长处显示出强烈的紫外可见吸收带。它们的光致发光光谱在绿色区域的 512- 543 nm 附近显示出最大波段。电化学和光谱电化学方法检测了空穴传输和电致变色特性。由二羧酸单体 2 与结构相似的二胺单体 N,N-双(4-氨基苯基)-Nâ²,Nâ²-二苯基-1,4-苯二胺(4a)制备的聚(胺酰胺)5a 在乙腈溶液中的循环伏安图显示出四个可逆氧化还原偶,E1/2 分别为 0.60、0.80、0.97 和 1.13 V。通过在 0.0 至 1.30 V 之间连续进行五次循环扫描,所有聚(胺酰胺)都表现出极佳的电致变色可逆性,颜色从最初的淡黄色中性形态变为绿色,然后再变为蓝色氧化形态。