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烽火诸侯: 金币+1, 翻译EPI+1 2016-03-16 14:59:41
烽火诸侯: 金币+10, ★★★很有帮助 2016-03-16 15:00:59
烽火诸侯(fjtony163代发): 金币+30, 代发 2016-03-16 17:54:14
选择性 是体现 探针性能 的一个 重要参数。在实际应用中 能够 对 客体 进行 高选择性识别 对 探针非常重要。本实验中 测试了 探针T2 对 各种常见离子的 响应情况，确定其 识别的 客体。如图3-1a，在 紫外光谱中 可以 观察到 探针T2 在562nm 处 没有 紫外吸收峰，在加入了 2倍当量的 Cu2+ 溶液 后，在562nm处 吸光度 明显的 提高 同时 颜色由 无色 变为 橙红色，同样的 条件下，加入 等量的K+、Na+、Ca2+、Mg2+、Zn2+、Cd2+、Mn2+、Pb2+、Fe3+溶液后，探针T2 在562nm处 没有 紫外吸收峰 并且 颜色没有明显的变化。
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.
如图3-1b所示，该探针 由于 环内酰胺结构，本身 是没有荧光的。再加入了 铜离子溶液 以后，该探针 从无色变为粉色 并且 伴随着 橙红色荧光。与没有加入铜离子之前 相比，在586nm 处 出现一个 强烈的 发射带 伴随着荧光增强。而加入了 其他阳离子溶液 没有明显的 荧光变化。此结果表明，探针T2 在DMF体系 对 铜离子 有良好的 选择性，这表明 该探针 可以作为一种 裸眼化学传感器 用于 铜离子检测。
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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