含吡啶-水楊亞胺基及水楊腙基螢光配體之膽固醇液晶混合物於金屬離子之檢測

Abstract

本論文成功合成出一系列含有吡啶水楊基席夫鹼化合物之螢光感測器，並對Zn2+具有特別的選擇性，探測極限可至10-7M，同時利用PL光譜儀鑑定其螢光機制。接著將此衍生物混摻於膽固醇相液晶中做為液晶感測器，並比較不同官能基之衍生物與不同金屬離子錯合後對膽固醇液晶相螺距之影響。此液晶混合物CNNP及CNP分別與Zn2+及Fe3+錯合後，顏色變化最顯著，兩者以肉眼觀察顏色皆由原本的橘色變成綠色，並以UV鑑定顏色之吸收峰，最後利用CD光譜探討加入金屬離子後含有旋性之結構是否會受到影響。

We synthesize a series of pyridinyl salicylaldehyde based fluorescence sensor, which can selectively respond to Zn2+, besides, the detection of limit is 10-7M, and we utilize PL to identify the fluorescence mechanism. These derivatives subsequently dope to cholesteric liquid crystal as a chemosensor, which can detect metal ions by changing the pitch of cholesteric liquid crystal phase, then we can see the change of color by eyes. We compare different probe to detect different metals in liquid crystal sensor. At first, the color of liquid crystal mixtures CNNP and CNP is orange. after CNNP complex zinic ion (Zn2+) and CNP complex iron(III) ion (Fe3+), both of them change to green. Here we use UV-Vis to identify the reflected band of color and use CD to measure whether adding metal ions will change molecule chirality or not.