作者:Michael Berger、Franz P. Schmidtchen
DOI:10.1021/ja992028k
日期:1999.11.1
site suitable for strong interaction with negatively charged guests. An anionic moiety balancing the overall host charge to zero is incorporated in a way to prevent collapsing into an ion pair. Using bicyclic guanidinium anchor groups for direct guest binding and a closo-borane cluster as an anionic countercharge the ditopic zwitterionic host 17 was designed and prepared in a convergent synthetic scheme
人工受体在溶剂化相中的阴离子络合需要通过相互的超分子相互作用完全或至少部分替代它们的溶剂化壳。补充依赖净静电荷或广泛的氢键进行客体络合的众所周知的方法,目前的工作重点是主体中电荷分离的替代概念,以创建适合与带负电荷的客体强相互作用的阳离子位点。以一种防止塌陷成离子对的方式并入阴离子部分,该部分将总体主体电荷平衡为零。使用双环胍锚定基团直接结合客体,并使用环硼烷簇作为阴离子反电荷,以收敛合成方案设计和制备双位两性离子主体 17。