Morphology, structure and chromatic properties of azobenzene-substituted polydiacetylene supramolelular assemblies
作者:Qiang Ye、Xian You、Gang Zou、Xiaowu Yu、Qijin Zhang
DOI:10.1039/b803333a
日期:——
An azobenzene mesogen-substituted polydiacetylene which self-assembles into stacks with bilayered two-dimensional structure is investigated in detail by transmission electron microscopy (TEM) as well as X-ray diffraction (XRD). These stacks with bilayer-structure are found to be organized into highly ordered lamellar crystal structures. The substituted polydiacetylene assemblies form a blue phase at room temperature, however, they undergo a well-known thermochromic transition in response to thermal stimulus. In this work, we establish links between chromatic transitions, molecular organization and the morphology of these assemblies. This thermochromic transition has been subjected to detailed investigation by means of Fourier transform infrared spectroscopy (FTIR), XRD as well as TEM. These results demonstrate that the strong intermolecular interaction (π–π stacking) between azobenzene mesogens is essential for complete recovery of chromatic transitions of PDA1 films following thermal stimulation.
通过透射电子显微镜(TEM)和 X 射线衍射(XRD)对偶氮苯中间体取代的聚二乙烯进行了详细研究,这种聚二乙烯可自组装成具有双层二维结构的堆栈。研究发现,这些具有双层结构的堆栈组织成高度有序的片状晶体结构。取代的聚二乙烯组装体在室温下形成蓝色相,但在热刺激下会发生众所周知的热变色转变。在这项工作中,我们建立了这些组装体的色变、分子组织和形态之间的联系。我们通过傅立叶变换红外光谱(FTIR)、XRD 和 TEM 对这种热变色转变进行了详细研究。这些结果表明,偶氮苯介质之间强烈的分子间相互作用(π-π堆积)是 PDA1 薄膜在热刺激后完全恢复色变的关键。