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【答案】應(yīng)助回帖
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選擇性 是體現(xiàn) 探針性能 的一個(gè) 重要參數(shù)。在實(shí)際應(yīng)用中 能夠 對(duì) 客體 進(jìn)行 高選擇性識(shí)別 對(duì) 探針?lè)浅V匾。本?shí)驗(yàn)中 測(cè)試了 探針T2 對(duì) 各種常見(jiàn)離子的 響應(yīng)情況,確定其 識(shí)別的 客體。如圖3-1a,在 紫外光譜中 可以 觀察到 探針T2 在562nm 處 沒(méi)有 紫外吸收峰,在加入了 2倍當(dāng)量的 Cu2+ 溶液 后,在562nm處 吸光度 明顯的 提高 同時(shí) 顏色由 無(wú)色 變?yōu)?橙紅色,同樣的 條件下,加入 等量的K+、Na+、Ca2+、Mg2+、Zn2+、Cd2+、Mn2+、Pb2+、Fe3+溶液后,探針T2 在562nm處 沒(méi)有 紫外吸收峰 并且 顏色沒(méi)有明顯的變化。
Selectivity is a important index for evaluating probe performance. In actual application, it is very important for probe to perform highly selective recognition on objects. In this experiment, we tested response performance of probe T2 on various common ions, so as to determined the object that can be recognized by probe T2. According to the UV spectrum in Fig.3-1a, it can observe that probe T2 displays no ultraviolet absorption peak at 562nm, however after adding double amount of equivalent Cu2+ solution, it can observe a significantly increased absorbance at 562nm as well as solution color changing from colorless to orange red. Under the same condition, through adding the same amount of K+, Na+, Ca2+, Mg2+, Zn2+, Cd2+, Mn2+, Pb2+, Fe3+, respectively, it can observe that probe T2 displays no ultraviolet absorption peaks, also the solution color remains unchanged.
如圖3-1b所示,該探針 由于 環(huán)內(nèi)酰胺結(jié)構(gòu),本身 是沒(méi)有熒光的。再加入了 銅離子溶液 以后,該探針 從無(wú)色變?yōu)榉凵?并且 伴隨著 橙紅色熒光。與沒(méi)有加入銅離子之前 相比,在586nm 處 出現(xiàn)一個(gè) 強(qiáng)烈的 發(fā)射帶 伴隨著熒光增強(qiáng)。而加入了 其他陽(yáng)離子溶液 沒(méi)有明顯的 熒光變化。此結(jié)果表明,探針T2 在DMF體系 對(duì) 銅離子 有良好的 選擇性,這表明 該探針 可以作為一種 裸眼化學(xué)傳感器 用于 銅離子檢測(cè)。
According to Fig. 3-1b, it can be seen the probe itself is not fluorescent due to its intra-annular lactam structure. After adding Cu2+ solution, this probe changed from colorless to pink accompanying orange red fluorescence. Compared with situation before adding Cu2+ solution, there is now an intensive emission band accompanying with increased fluorescence after adding Cu2+ solution; however by other cation solutions, the system is of no significant fluorescence change. This indicates that probe T2 is of sound selectivity to Cu2+ in DMF system, therefore this probe can be used as an unaided eye chemical sensor for Cu2+ recognition. |
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