Diverse colorimetric changes of polydiacetylenes with cationic surfactants and their mechanistic studies
作者:Kyung Mi Lee、Jong Hun Moon、Hyeryeong Jeon、Xiaoqiang Chen、Hee Jin Kim、Sol Kim、Sung-Jin Kim、Jin Yong Lee、Juyoung Yoon
DOI:10.1039/c1jm12818c
日期:——
Polydiacetylenes (PDAs), a family of conjugated polymers, are known to show stimulus-induced apparent blue-to-red transitions, which have led to the development of a variety of PDA-based chemosensors. However, in most cases, recognition sites were introduced at the terminal ends of PDAs, therefore, recognition processes on the surface of PDAs have been the primary stimulations to induce blue to red colorimetric changes. In this study, we reported that diverse colorimetric changes can be observed for PDA based sensors in which penetration of cationic surfactant into PDAs bearing benzoic acid groups can cause not only the typical blue to red change but also blue to violet, blue to yellow or blue to orange color change. We systematically demonstrated that these novel findings can be used effectively to discriminate different cationic surfactants by using three different PDAs. Furthermore, theoretical calculations and transmission electron microscope (TEM) images also confirm these unique colorimetric changes. These results suggest a new direction in which to design colorimetric sensors based on PDA polymers.
聚二乙炔 (PDA) 是一类共轭聚合物,已知会表现出刺激诱导的明显的蓝到红转变,这导致了各种基于 PDA 的化学传感器的开发。然而,在大多数情况下,识别位点是在PDA的末端引入的,因此,PDA表面的识别过程是引起蓝色到红色色度变化的主要刺激。在这项研究中,我们报道了基于 PDA 的传感器可以观察到多种比色变化,其中阳离子表面活性剂渗透到带有苯甲酸基团的 PDA 中不仅可以引起典型的蓝色到红色的变化,而且还可以引起蓝色到紫色、蓝色到黄色或蓝色的变化。变为橙色。我们系统地证明了这些新发现可以通过使用三种不同的 PDA 来有效地区分不同的阳离子表面活性剂。此外,理论计算和透射电子显微镜(TEM)图像也证实了这些独特的色度变化。这些结果提出了基于 PDA 聚合物设计比色传感器的新方向。