A Macrobicyclic Receptor with Versatile Recognition Properties: Simultaneous Binding of an Ion Pair and Selective Complexation of Dimethylsulfoxide
作者:Martin J. Deetz、Maoyu Shang、Bradley D. Smith
DOI:10.1021/ja994487r
日期:2000.7.1
affinities are enhanced in the order: K+ (9-fold enhancement) > Na+ (8-fold enhancement) ≫ Cs+ (no enhancement). An X-ray crystal structure shows that the receptor binds sodium chloride as a solvent-shared ion pair. The receptor has very weak affinity for acetonitrile, nitromethane, or acetone in chloroform solvent, whereas the association constant for dimethylsulfoxide is 160 M-1 at 295 K. An X-ray crystal
合成了一种双环受体,并评估了它在有机溶剂中结合碱金属卤化物盐和极性中性分子的能力。受体设计相对简单,因为它是二苯并 18-冠 6 和桥连 1,3-苯基二甲酰胺的组合。在 1 mol 当量的金属阳离子存在下,氯化物亲和力按以下顺序增强:K+(9 倍增强)> Na+(8 倍增强)≫ Cs+(无增强)。X 射线晶体结构显示受体结合氯化钠作为溶剂共享离子对。该受体对氯仿溶剂中的乙腈、硝基甲烷或丙酮的亲和力非常弱,而二甲基亚砜的缔合常数在 295 K 时为 160 M-1。X 射线晶体结构显示二甲基亚砜深深地结合在受体腔中,并通过桥接水分子与受体形成氢键。还有证据表明 CH-O 相互作用。固液萃取研究表明,受体...