The computer program CAVEAT was used to design a linker structure to connect four imidazole 4-carboxamide groups in a distorted square planar arrangement optimal for binding Cu(II) ions. The resulting macrocyclic structure was prepared by the synthesis of a protected monomer followed by amide coupling reactions to form the cyclic tetramer. Binding to Cu(II) ion was evaluated using the inherent fluorescence of the receptor and its quenching upon binding to Cu(II) ion. Much higher concentrations of Zn(II), Co(II), and Ni(II) ions had little or no effect on the fluorescence and did not significantly compete with the fluorescence response to Cu(II) ions.
计算机程序CAVEAT被用于设计一种连接结构,将四个
咪唑4-羧酰胺基团以扭曲的平面方块排列方式连接起来,这种结构最有利于结合Cu(II)离子。通过合成保护性的单体,然后进行酰胺偶联反应形成环四聚体,制备出所得的环状大环结构。利用受体的固有荧光及其在结合Cu(II)离子时的淬灭效应,评估了其与Cu(II)离子的结合能力。较高浓度的Zn(II)、Co(II)和Ni(II)离子对荧光影响甚微或无影响,并且不会显著与Cu(II)离子的荧光响应竞争。