Slow Anion Exchange, Conformational Equilibria, and Fluorescent Sensing in Venus Flytrap Aminopyridinium-Based Anion Hosts
作者:Karl J. Wallace、Warwick J. Belcher、David R. Turner、Kauser F. Syed、Jonathan W. Steed
DOI:10.1021/ja034921w
日期:2003.8.1
The synthesis, anion binding, and conformational properties of a series of 3-aminopyridinium-based, tripodal, tricationic hosts for anions are described. Slow anion and conformational exchange on the (1)H NMR time scale at low temperature, coupled with NMR titration, results in a high level of understanding of the anion-binding properties of the compounds, particularly with respect to significant conformational
描述了一系列基于 3-氨基吡啶鎓的三足三阳离子宿主的合成、阴离子结合和构象特性。低温下 (1)H NMR 时间尺度上缓慢的阴离子和构象交换,加上 NMR 滴定,导致对化合物的阴离子结合特性的高度理解,特别是关于诱导引起的显着构象变化适合络合。观察到卤化物,尤其是 Cl(-) 的峰值选择性。该方法已扩展到基于含有光活性蒽基部分的 3-氨基吡啶鎓“臂”的双足和三足足。与类似的未取代的三(3-氨基吡啶鎓)类似物相比,1,3,5-三足宿主对乙酸盐比其他阴离子具有显着的选择性,尽管低温 (1) H NMR 实验揭示了总共四种乙酸盐结合构象。蒽单元的光二聚化导致潜在荧光阴离子传感器的形成。