Cis- and Trans-Strapped Calix[4]pyrroles Bearing Phthalamide Linkers: Synthesis and Anion-Binding Properties
作者:Chang-Hee Lee、Jin-Suk Lee、Hee-Kyung Na、Dae-Wi Yoon、Hidekazu Miyaji、Won-Seob Cho、Jonathan L. Sessler
DOI:10.1021/jo0487146
日期:2005.3.1
gauged from both sets of analyses, these new strapped systems display affinities for halide anions that are enhanced compared to those of normal, unstrapped calix[4]pyrrole. However, contrary to expectations, no size-dependent selectivity for anions is observed as the length of the bridging strap is varied. Such results are interpreted in terms of anion-binding processes that occur outside the central
新顺式绑杯[4]吡咯衍生物12,13,和19和反式绑系统14和15连接到四吡咯烷核上的带有间苯二甲酸酯的二酰胺间隔基已被合成并通过光谱学手段进行了表征。这些受体的阴离子结合行为通过质子NMR光谱和等温滴定热量法(ITC)进行了研究。在NMR分析的条件下观察到2:1的结合化学计量,但在ITC所用的较低浓度下却未观察到。从这两组分析中可以看出,这些新的带状体系显示出对卤化物阴离子的亲和力,与普通的,未带状的杯[4]吡咯的亲和力相比有所提高。然而,与预期相反,当桥接带的长度变化时,没有观察到阴离子对尺寸的选择性。