具有聚集誘導螢光性質之4'-正戊基-4-氰基聯苯衍生物的光物理性質探討及其感測應用

研究生：蔡家穎指導教授：陳志欣博士論文提要內容：本篇研究主要是探討4-cyano-4'-pentylbiphenyl(5CB)衍生物，即4'-(2-((2-hydroxyethyl)amino)ethyl)-[1,1'-biphenyl]-4-carbonitrile(NC2O)和4'-(2-((3-hydroxypropyl)amino)ethyl)-[1,1'-biphenyl]-4-carbonitrile(NC3O)，在長烷鏈上修飾上胺基和羥基，研究其對光學性質的影響。UV-Vis光譜顯示這些分子在230 nm至330 nm處表現出與5CB相同的吸收峰。就其螢光性質而言，當水的比例越高時，NC2O和NC3O在DIW/THF溶液中發出更強的熒光，呈現出5CB所沒有的典型AIE現象。通過理論計算，我們發現烷基鏈上的氨基和羥基形成分子間氫鍵，這解釋了NC2O和NC3O的AIE性質。這種獨特的光學特性使這些分子具有應用在感測上的潛力，我們將NC3O應用在試紙上，在365 nm UV燈的照射下，在試紙上滴入含有微量水的有機溶劑，觀察到螢光變化來分析水含量。

關鍵字

聚集誘導放光；檢測水含量；試紙

並列摘要

In this study, we investigated the fluorescence properties of two 4-cyano-4’-pentylbiphenyl (5CB) analogs, i.e., 4'-(2-((2-hydroxyethyl)amino)ethyl)-[1,1'-biphenyl]-4-carbonitrile (NC2O) and 4'-(2-((3-hydroxypropyl)amino)ethyl)-[1,1'-biphenyl]-4-carbonitrile (NC3O), of which the alkyl chains were introduced with amino and hydroxyl groups. The UV-Vis spectra revealed that these molecules exhibited the same absorption peak at 230 nm to 330 nm as 5CB. As for their fluorescence properties, NC2O and NC3O emitted stronger fluorescence in DIW/THF solutions when the proportion of water was higher, showing the typical AIE phenomenon which was not exhibited by 5CB. Through theoretical calculations, we found the formation of intermolecular hydrogen bonding by the amino and hydroxyl groups on the alkyl chains, which explains the AIE properties of NC2O and NC3O. This unique optical property makes these molecules potential for sensing applications.