Is [N<sup>+</sup>−H···O] Hydrogen Bonding the Most Important Noncovalent Interaction in Macrocycle−Dibenzylammonium Ion Complexes?
作者:Pin-Nan Cheng、Po-Yi Huang、Wan-Sheung Li、Shau-Hua Ueng、Wei-Chung Hung、Yi-Hung Liu、Chien-Chen Lai、Yu Wang、Shie-Ming Peng、Ito Chao、Sheng-Hsien Chiu
DOI:10.1021/jo052411+
日期:2006.3.1
host molecule in which one diethylene glycol chain (i.e., a loop possessing only three oxygen atoms) incorporated along with two phenolic aromatic rings is linked by a xylene spacer into a macroring. The design of the molecular structure of this macrocycle “amplifies” any potential [cation···π], [N+−H···π], and [N+C−H···π] interactions between the dibenzylammonium (DBA+) ion and the phenolic rings of
我们报告了一个新的宿主分子,其中一个二甘醇链(即,仅具有三个氧原子的环)与两个酚醛芳香环结合在一起,并通过二甲苯间隔基连接到一个大环上。该大环分子结构的设计“放大”了二苄基铵之间的任何可能的[阳离子···π],[N + -H···π]和[N + CHH···π]相互作用( DBA +)离子和大环的酚环;因此,这些物质在CD 3 NO 2中显示出非常强的结合亲和力(K a = 15000 M - 1)。该大环还以[2]假轮烷形式与双吡啶鎓离子配位,这使其成为已知的在溶液中络合DBA +和双吡啶鎓离子的最小的大环(即25元环)。为了明确确认溶液中存在这些假轮烷,我们合成了它们相应的互锁分子,即轮烷和链烷。