合成檢測氰離子與銅離子之螺吡喃共聚合物

Abstract

本論文成功設計出具有高度選擇性及靈敏性檢測銅離子的高分子感測器，以親水基團異丙基丙醯胺單體與四苯基乙烯-螺吡喃單體聚合成光致變色高分子，此高分子不僅溶於常見有機溶劑，例如四氫呋喃、二氯甲烷、氯仿、二甲基亞碸，也溶於水。當含水量大於70%，由於聚集誘導效應展現了高強度的光致發光現象。其中P1，P2在紫外光、可見光、酸鹼調控下有著良好光致發光特性，當照射紫外光螺吡喃展現高靈敏開關，當照射可見光或添加CN-離子四苯基乙烯展現聚集誘導發光。而P2有著高選擇性、高靈敏性在水中偵測銅離子，其偵測極限為0.41 uM。

Three novel photochromic-fluorescent polymers (P1, P2, P3) which consist of N-isopropylacrylamide (NIPAM) as a hydrophilic unit and tetraphenylethylene-spiropyran (TPE-SP) monomer as a fluorophore and photochromic unit are reported. These synthesized polymers are not only soluble in many common organic solvents, such as tetrahydrofuran (THF), dichloromethane, chloroform, methanol and dimethyl sulfoxide (DMSO), but also soluble in water. The polymers exhibited strong emission in the solution which contain more than 70% water due to the TPE aggregation. P1 and P2 respond to good photochromic properties of spiropyran under UV irradiation, visible light as well as acid-base conditions. Especially, P1 and P2 in close form (CF) show high sensitivity with UV light and totally change to open form (OF) within 90 seconds whereas acidic media remains unaffected. Under open form, TPE units in polymers are non-emissive which could be turned on by visible light or addition of cyanide ion. Moreover, the polymer P2-OF showed high selectivity and sensitivity toward Cu2+ in aqueous solution with low limit of detection (0.41 M), which indicates a promising sensor device for future practical applications in chemical, environmental, and biological systems.