A Highly K<sup>+</sup>-Selective Fluorescent Probe - Tuning the K<sup>+</sup>-Complex Stability and the K<sup>+</sup>/Na<sup>+</sup>Selectivity by Varying the Lariat-Alkoxy Unit of a Phenylaza[18]crown-6 Ionophore
作者:Thomas Schwarze、Radu Schneider、Janine Riemer、Hans-Jürgen Holdt
DOI:10.1002/asia.201500956
日期:2016.1
towards the K+‐complex stability and K+/Na+ selectivity. The highest K+‐complex stability showed fluoroionophore 4 with a dissociation constant Kd of 19 mm, but the Kd value increases to 31 mm in combined K+/Na+ solutions, indicating a poor K+/Na+ selectivity. By contrast, 6 showed even in the presence of competitive Na+ ions equal Kd values (KdK+=45 mm and KdK+/Na+=45 mm) and equal K+‐induced fluorescence
一个理想的目标是合成易于获取且具有高K + / Na +选择性的氟离子载体,以监测体内和体外的生理K +水平。因此,必须开发高度K + / Na +选择性离子载体。在此,我们在只有四个合成的序列而获得步骤a集合K的+响应性荧光探针4,5和6。在一个系统的研究中,我们调查了烷氧基取代的影响在邻位的苯胺部分的位置在π共轭苯胺-1,2,3-三唑-香豆素fluoroionophores 4,5和6 [R = MeO(4),EtO(5)和i PrO(6)]对K +-络合物的稳定性和K + / Na +的选择性。最高的K +复合物稳定性显示氟离子载体4的解离常数K d为19 m m,但在组合的K + / Na +溶液中K d值增加至31 m m,表明K + / Na +的选择性差。相比之下,6甚至在竞争性Na +离子存在的情况下也显示出相同的K d值(K d K + = 45 m m和K d K + /