Supramolecular organisation of oligo(p-phenylenevinylene) at the air–water interface and in water
作者:Pascal Jonkheijm、Michel Fransen、Albertus P. H. J. Schenning、E. W. Meijer
DOI:10.1039/b103966k
日期:——
aggregate in chiral stacks, as can be concluded from UV–vis, fluorescence and CD spectroscopy. Temperature dependent measurements showed for OPV1 a transition at 50 °C from a chiral aggregated state to disordered aggregates. In the case of bolaamphiphilic OPV2, the transition at 55 °C between those states is a less cooperative process. The chiral order in the assemblies of the bolaamphiphiles can be influenced
合成了两种新颖的手性(博拉)两亲性低聚物(对苯撑亚乙烯基)(OPV)并对其进行了全面表征。在一侧用亲水性三[四(环氧乙烷)]苯楔和在另一侧用疏水性三(烷氧基)苯楔装饰疏水性OPV主链,得到两亲性OPV1。在双亲性亲油OPV2中,两个亲水的三[四(环氧乙烷)]苯楔形分子连接在OPV主链的两端。已经在空气-水界面和水中对两亲物的组织进行了研究。OPV1的Langmuir单层膜表明,这些两亲物在空气-水界面处垂直定向。对于OPV2,OPV单元平放在子相上,亲水性乙二醇楔形物指向水相。在氯仿中,OPV衍生物以分子溶解形式存在。在水中,两亲OPV衍生物聚集在手性堆栈中,这可以从UV-vis,荧光和CD光谱学得出结论。温度相关的测量结果显示,OPV1在50°C时从手性聚集态过渡到无序聚集体。就嗜两性OPV2而言,这些状态之间在55°C的转变是一个较不协调的过程。盐的添加会影响双亲性亲脂分子装配体中的手性顺序。