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中文摘要：
设计合成了2种新型N-芳基香豆素甲基酮缩氨基硫脲受体分子S1和S2, 利用紫外-可见（UV-Vis）吸收光谱考察了其对Fe3＋, Hg2＋, Ag＋, Ca2＋, Cu2＋, Zn2＋, Pb2＋, Cd2＋, Ni2＋, Cr3＋和Mg2＋等阳离子的识别作用. 结果表明, 当加入Cu2＋时, 溶液颜色立刻由无色变为黄色, 而加入其它阳离子则无变化, 从而实现了对Cu2＋的裸眼检测, 具有专一选择性比色识别效果. 通过计算可知, 受体分子S2对Cu2＋的络合常数大于S1, 且主客体间形成1： 1的配合物. 受体分子S2对Cu2＋的检出限为2.0×10-7 mol/L, 稳定常数Ks=1.02×105 L/mol. 另外, 在EDTA存在时, 配合物可以释放出Cu2＋, 与EDTA结合, 表现出对Cu2＋的＂off-on＂模式.
英文摘要：
Two new N-aryl coumarin methyl ketone thiosemicarbazone receptors were designed and synthesized. The binding properties of the receptors with cations such as Fe3＋, Hg2＋, Ag＋, Ca2＋, Cu2＋, Zn2＋, Pb2＋, Cd2＋, Ni2＋, Cr3＋ and Mg2＋ in DMSO were investigated by UV-Vis spectroscopy. A clear color change from colorless to yellow was observed upon the addition of Cu2＋ to the solution of the two receptors in DMSO by naked-eyes and a single selectivity colorimetric recognition. The results showed that the two receptors had a better selectivity for Cu2＋, but exhibited no evident binding with others cations. The data showed that the two receptors had different binding abilities with Cu2＋. The UV-Vis data indicated that a 1：1 stoichiometry complex was formed between the receptor and Cu2＋. The detection limit of the sensor S2 toward Cu2＋ is 2.0×10-7 mol/L and an association constant Ks of 1.02×105 L/mol was measured. The sensing of Cu2＋ by this sensor was found to be reversible, with the Cu2＋-induced color being lost upon the addition of EDTA. The process of titrating sensor S2 with Cu2＋ is reversible, and compound S2 could be used as an off-on switch chemosensor.
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