以4-硝基苯肼、8-羟基喹哪啶等为原料设计合成了8-羟基-2-喹啉甲醛-4-硝基苯腙(1)，经元素分析、1 H NMR 对其结构进行了表征。在V (二甲亚砜)/V (甲醇)＝1∶9混合溶剂中采用 UV-Vis 光谱法研究了苯腙(1)对 Li＋、K＋、Mg2＋、Ca2＋、Mn2＋、Co2＋、Ni2＋、Zn2＋、Cd2＋、Hg2＋、Fe2＋、Fe3＋及 Cu2＋离子的识别性能。结果表明，苯腙1仅对 Cu2＋和 Zn2＋有特殊的识别能力，加入 Cu2＋或 Zn2＋的苯腙1溶液由黄色分别变为橙色和红色，其光谱在413 nm 处的吸收峰强度减小，且分别在485和508 nm 附近产生新的吸收峰。竞争实验表明，苯腙1对 Zn2＋的检测不受除 Cu2＋以外上述其它阳离子影响，而对 Cu2＋的检测不受上述任何其它阳离子的影响。线性拟合结果显示，苯腙1与 Cu2＋和 Zn2＋ 分别形成了1∶1和1∶2的配合物。
8-hydroxy-2-quinoline formaldehyde-4-nitrophenylhydrazone (1)was synthesized by using 4-nitrophe-nyl hydrazine and 8-hydroxyquinaldine as starting materials and its structure was characterized by elemental analysis,1 H NMR.The influence of Li+ ,K+ ,Mg2 + ,Ca2 + ,Mn2 + ,Co2 + ,Ni2 + ,Zn2 + ,Cd2 + ,Hg2 + ,Fe2 + , Fe3 + and Cu2 + on the spectra of phenylhydrazone 1 were investigated by the UV-Vis spectrum method in V (DMSO)/V (methanol)=1 ∶9 mixed solvent.The result indicated that the UV-Vis spectra of phenylhydra-zone 1 only behaved special recognition and sensitivity to Cu2 + and Zn2 + .The color of phenylhydrazone 1 was changed from yellow to orange or red upon adding Cu2 + or Zn2 + respectively,which resulted in the decrease in the absorption at 413 nm and the new absorption near 485 nm and 508 nm.Competition experiments indicated that other cations but Cu2 + had no effect on the detection of Zn2 + ,while the presence of other ions had no effect on the detection of Cu2 + .The fitting results of linear display that the 1 ∶1 and 1 ∶2 binding stoichiometry of phenylhydrazone 1 with Cu2 + and Zn2 + respectively.
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