本論文之目的乃為設計含皇冠醚取代之二苯乙烯螢光發光團的新型共軛高分子作為螢光感應器之應用。實驗結果發現所設計的Polymer 1和Polymer 2皆能受到Ca2+及Y3+的影響產生螢光紅側偏移的感應效果, 顯示此螢光變化乃不需要兩端皇冠醚取代之二苯乙烯螢光發光團。螢光偏移可能是金屬離子與取代基產生錯合而讓主軸變得更平坦而增強共軛性所致。據此另外合成了小分子的共軛模型, 經由模型的螢光感應結果及X-光單晶結構數據來驗證我們的假設。結果顯示共軛高分子的感應靈敏度較小分子模型更為優秀。另外, 我們也試著將兩個皇冠醚取代之二苯乙烯螢光發光團連結在一起, 欲利用兩個皇冠醚共同抓住較大的金屬離子來設計新的螢光化學感應器, 初步結果並不理想。 The purpose of this work is to design an energy transfer-based sensory conjugated polymer with both end capped with mono-aza-15-crown-5 subsituted stilbene fluorophores. A red shift of fluorescence emission induced by Ca2+ and Y3+ has been found for both polymer 1 and polymer 2, indicating that the stilbene fluorophores have nothing to do with the fluorescence response. The increase of conjugation of the polymer backbone due to metal ion-induced conformational change is attributed to the red shift of emission. Results from similar emission studies on the model segment and its X-ray crystal structure support our proposition and also demonstrated the better sensing performance of polymer vs. monomer. In addition, attempts to form a bis(crown-stilbene)-based sensor by taking advantage of the double crown receptors for large metal ions has been shown to be unsuccessful.
