A series of acyclic and macrocyclic nucleobase derivatives that contain uracil and 2-thiocytosine units linked by polymethylene spacers was prepared. The length of spacers as well as the oxidation number of sulfur atoms entering into the structure of the compounds was varied. The crystal structure of pyrimidinophane with hexa- and heptamethylene linkers was established by X-ray analysis. The metal ion-binding properties of pyrimidinophanes and their acyclic counterparts were investigated by liquid extraction and 1H NMR titration experiments. The compounds with 2-thiocytosine fragments revealed a high selectivity of extraction towards Ag+ ions. The stoichiometry of silver complexes and the binding constants have been determined. The antibacterial activity of these complexes was also discussed.
一系列含有尿
嘧啶和2-
硫胞嘧啶单元并通过聚亚甲基间隔相连的非环和宏环核碱衍
生物被制备出来。间隔的长度以及进入化合物结构的
硫原子的氧化数被改变。通过X射线分析确定了含有六亚甲基和七亚甲基连接体的
嘧啶冠醚的晶体结构。通过液体萃取和1H NMR滴定实验研究了
嘧啶冠醚及其非环对应物的
金属离子结合性质。含有2-
硫胞嘧啶片段的化合物显示出对Ag+离子的高选择性萃取。确定
银络合物的
化学计量比和结合常数。这些络合物的抗菌活性也进行了讨论。