作者:Stephan Amthor、Christoph Lambert、Barbara Graser、Dirk Leusser、Carola Selinka、Dietmar Stalke
DOI:10.1039/b407048h
日期:——
Thianthrenophane 1 has a cavity which offers enough room to potentially enable endohedral coordination to small ions or molecules. For the complexation of silver(I) perchlorate the complex stability constants of 1 logK1
= 5.45 ± 0.13 and of thianthrene logK2
= 9.16 ± 0.10 were determined by UV/Vis titration. Single competition transport experiments with ten metal salts demonstrate a very high selectivity of 1 as a carrier for silver(I) and a distinctly higher transport rate compared to carriers such as thianthrene and 1,4,8,11-tetrathiacyclotetradecane (14-ane-S4). Although the X-ray crystal structure analysis of the polymeric [Ag(1)]ClO4·(dioxane)7 complex shows an exohedral coordination to silver(I) we suggest that the formation of an endohedral [Ag(1)]+ complex is the explanation for the unusual carrier selectivity of silver(I) by 1 in bulk liquid membrane.
Thianthrenophane 1 具有一个空腔,为小离子或小分子的内面配位提供了足够的空间。通过紫外/可见滴定法测定了 1 与高氯酸银(I)的络合稳定性常数 logK1 = 5.45 ± 0.13,与噻蒽的络合稳定性常数 logK2 = 9.16 ± 0.10。用十种金属盐进行的单次竞争迁移实验表明,1 作为银(I)的载体具有极高的选择性,与噻蒽、1,4,8,11-四硫杂环十四烷(14-ane-S4)等载体相比,其迁移率明显更高。虽然聚合物 [Ag(1)]ClO4-(dioxane)7 复合物的 X 射线晶体结构分析表明其与银(I)呈外向配位,但我们认为,内向 [Ag(1)]+ 复合物的形成是 1 在体液膜中对银(I)具有不同寻常的载体选择性的原因。