Deltamides and Croconamides: Expanding the Range of Dual H‐bond Donors for Selective Anion Recognition
作者:Vincent E. Zwicker、Karen K. Y. Yuen、David G. Smith、Junming Ho、Lei Qin、Peter Turner、Katrina A. Jolliffe
DOI:10.1002/chem.201704388
日期:2018.1.24
differences in anion binding selectivity were observed upon comparison of the dual H‐bond cores. Whereas the squaramides display similar affinity for both chloride and acetate ions, the ureas have significantly higher affinity for acetate than chloride ions and the deltamides display higher affinity for dihydrogenphosphate ions than other oxoanions or halides. These inherent differences in binding affinity
双氢键供体被广泛用作阴离子受体的识别基序。我们报告了一个双H键受体文库的合成,该文库结合了分别称为deltamides和croconamides的delticamide和croconic acid衍生物,并比较了它们的阴离子结合亲和力(对于单价物质)和Brønsted酸与井中的酸建立的尿素和方酰胺双重H键供体基序。对于具有相同取代基的双氢键核,布朗斯台德酸度的趋势是大分子烯酮酰胺>方酸酰胺>δ-酰胺>尿素,与相应的尿素相比,大分子烯醇酰胺的酸性高10-15 p K a单位。与尿素,deltamides和squaramides显示的趋势相反,N,N'-二烷基交联酰胺显示出比N,N'-二芳基衍生物更高的对氯的结合亲和力,这归因于N,N'-二芳基衍生物在中性pH下的部分去质子化。比较双H键核后,在阴离子结合选择性上存在许多差异。方酸酰胺对氯离子和乙酸根离子显示相似的亲和力,而脲对氯乙酸根的亲和力